Free tools that run in your browser

Enter your height and weight to calculate your body mass index and see which category you fall into.

Generate truly unbiased random numbers in any range, one or thousands, with or without repeats, sorted, or with decimals.

Flip 1 to 1000 coins and see the heads or tails tally instantly.

Count words, characters, sentences, paragraphs, and lines. Reading time estimate, char-limit indicators for X, LinkedIn, meta titles, and more.

Convert centimeters to inches or inches to centimeters, with results shown in decimal and feet-and-inches format.

Convert between kilograms, pounds and stones instantly by typing a value into any field.

Convert temperatures between Celsius and Fahrenheit in both directions with formulas shown.

Convert millimeters to inches and vice versa with exact precision using this free browser-based calculator.

Generate QR codes for URLs, text, Wi-Fi, contact cards. Custom size, colors, error correction. Download as PNG or SVG. 100% client-side.

Calculate compound interest with optional monthly contributions and view a year-by-year investment growth table.

Enter your courses, letter grades and credit hours to calculate your GPA on a standard 4.0 scale with plus and minus support.

Calculate the exact number of weeks and leftover days in any given year or a standard year.

Count the days between two dates, or add and subtract days, weeks, months, years and business days from any date.

Enter a birth date to calculate age in years, months, days, total days lived, and time until the next birthday.

Calculate monthly car payments based on vehicle price, down payment, interest rate and loan term.

Compute monthly payments, total interest and total cost for any fixed-rate loan with instant results.

Work out X% of Y, what percent one number is of another, percentage change, increase, decrease and difference, with the formula shown.

Generate Code 128, Code 39, EAN-13, UPC-A, EAN-8 and ITF barcodes as SVG with automatic check digit calculation.

Estimate cubic yards or bags of concrete needed for slabs and footings by entering your project dimensions.

Calculate the exact exam score you need on your final to achieve your target course grade.

Estimate your total daily energy expenditure based on age, sex, weight, height and activity level.

Convert numbers to Roman numerals and back, with a step-by-step breakdown, dates in Roman numerals and values up to 3,999,999.

Roll any combination of dice online using NdS+M notation with up to five sets at once.

Enter a bill amount, pick a tip percentage, and split the total among any number of people with optional rounding.

Translate text to Morse code and Morse back to English, live. Play it as audio at any speed, with a full alphabet chart.

Convert between US cups and fluid ounces instantly for cooking and baking recipes.

Add, subtract, multiply or divide two fractions and get the simplified result with steps shown.

Estimate the total savings needed for retirement based on your current age, income, and target replacement rate.

Calculate the exact number of seconds in a day or any number of days instantly.

Convert between liters, US gallons, and UK imperial gallons in either direction with exact conversion factors.

Convert miles to kilometers and kilometers to miles instantly with the exact 1.609344 factor.

Convert fluid ounces to US gallons and back again with a simple, instant calculator.

Convert between pounds and ounces in both directions with decimal and mixed lb+oz output.

Convert feet and inches to meters, or meters to feet and inches, with exact precision.

Convert liters to US fluid ounces and vice versa using exact conversion factors.

Convert tablespoons to US cups, fluid ounces and milliliters for cooking and baking recipes.

Generate strong random passwords with configurable length, character classes, and exclusions. Real entropy meter, crack-time estimate, bulk mode.

Convert centimeters to feet and inches for human height measurements, with decimal feet included.

Click to copy the degree symbol and find Alt codes, keyboard shortcuts and HTML entities for every platform.

Convert grams to pounds and vice versa using the exact international avoirdupois conversion factor.

Generate random never have I ever statements for party games, choosing a category and how many prompts you need.

Convert centimeters to millimeters and millimeters to centimeters instantly in your browser.

Convert decimals to simplified fractions or mixed numbers, and fractions to decimals, including repeating decimals.

Type a question and shake the magic 8 ball to get one of the 20 classic answers instantly.

Simplify ratios, solve proportions for a missing value, and scale numbers with this free ratio calculator.

Find the slope, distance, angle and line equation between any two coordinate points instantly.

Calculate the square footage of one or more rectangular rooms and get the total area in square feet.

A random yes or no wheel and decision maker with an optional Maybe result, running entirely in your browser.

Generate placeholder text, words, sentences, or paragraphs. Classic lorem ipsum plus alternatives (hipster, cupcake, pirate). HTML-wrapped output option.

Generate random words for games, writing prompts and naming. Filter by nouns, verbs, adjectives or adverbs, first letter and length.

Compute the area of common 2D shapes including rectangles, circles, triangles, trapezoids and ellipses.

Generate random fantasy names for RPG characters, stories and games with one click.

Calculate the least common multiple (LCM) and greatest common factor (GCF) for two or more integers instantly.

Convert between 24-hour military time and 12-hour standard time instantly with this free browser-based tool.

Test if a number is prime, see its prime factorization, or list all primes up to a limit.

Convert quarts to cups and cups to quarts instantly for baking and cooking recipes.

Add, subtract or find the difference between two durations in hours, minutes and seconds.

Format, validate, and beautify JSON online. 100% client-side, your data never leaves your browser.

Convert WebP to JPG, PNG or WebP in your browser. Batch files, set quality, pick a background for transparency. Nothing is uploaded.

Find the percentage increase, decrease or percent difference between two values with this free browser-based calculator.

Add sales tax to a price or extract it from a total by entering an amount and tax rate.

A reference of heart symbols to copy and paste, with Unicode code points, HTML entities and keyboard shortcuts for Windows, Mac and Linux.

Convert milliliters to US fluid ounces and vice versa with exact conversion factors.

Estimate your one repetition maximum from a submaximal set using the Epley and Brzycki formulas.

Play rock paper scissors against the computer locally in your browser and track your win-loss record.

Compute mean, median, mode, variance and standard deviation from any list of numbers instantly in your browser.

Paste HTML and see it rendered live in a sandboxed preview. Format and beautify messy markup, inline CSS and JS. Desktop, tablet and mobile widths.

Convert numbers between binary, octal, decimal and hexadecimal, binary to decimal, hex to decimal and back. BigInt-backed for any length.

Compress JPEG, PNG, and WebP images in your browser. Adjustable quality, batch mode. Files never leave your device.

Encode and decode Base64 strings and files. Client-side, safe for sensitive data.

Pick colors, convert hex/RGB/HSL/OKLCH, and check WCAG contrast.

Calculate the mean, median, mode and range for any list of numbers instantly in your browser.

Estimate body fat percentage using the US Navy circumference method with height, neck, waist and hip measurements.

Enter your assignment scores and category weights to calculate your overall class grade instantly.

Convert kilometers to meters and back again by typing a value into either field for an instant result.

Convert knots to miles per hour and vice versa using the exact international standard conversion factor.

A fun, deterministic love calculator that turns two names into a love percentage.

Enter any two of pace, time and distance to calculate the third in minutes per mile or minutes per kilometer.

Generate random usernames in cool, gamer, professional or cute styles instantly in your browser.

Scramble words, shuffle letters, or jumble entire sentences instantly with this free browser-based tool.

Encode and decode ROT13 and arbitrary Caesar shifts. Letter frequency analysis. 100% client-side.

Translate binary to text and text to binary, hex, decimal or octal, both ways, live. Full UTF-8 and emoji support with a per-character table.

Calculate IPv4 subnets, network, broadcast, usable range, wildcard mask. Input CIDR (/24) or dotted mask (255.255.255.0). Binary visualization.

Generate realistic fake names for testing, mockups and stories. Choose gender, name format and count, then copy or download as CSV.

A collection of arrow symbols to copy and paste, including directional, double, curved and decorative arrows with Unicode references.

Estimate the tons or cubic yards of gravel required for driveways, paths, and patios based on your dimensions.

Convert between ounces and grams in either direction using the exact international conversion factor.

Enter any two sides of a right triangle to solve for the missing third side using the Pythagorean theorem.

Convert teaspoons to milliliters and back using exact US, metric and UK teaspoon definitions.

Apply Unicode distortion and glitch effects to any text using combining characters.

Compare two text blocks line-by-line or word-by-word. Unified and split view. Shows added, removed, and changed segments with full color coding.

Convert dog years to human years based on breed size using the standard veterinary formula.

Convert between hourly wages and annual salaries by entering your pay rate, hours per week, and weeks worked per year.

Convert temperatures between kelvin, celsius, and fahrenheit with a single input field.

Paste your items and shuffle them into a completely random order instantly.

Convert minutes to hours (decimal and h:mm) or hours to minutes instantly in your browser.

Enter coefficients a, b and c to solve a quadratic equation, showing real or complex roots, the discriminant and the vertex.

Paste a list of names and draw one or more winners at random, directly in your browser.

Convert square meters to square feet and vice versa for floor space measurements.

Convert SVG to PNG, JPEG or WebP at any size, 1× to 8× or exact pixels. Transparent or solid background. Batch files, all in your browser.

Pick random letters from A to Z: one or many, upper or lower case, vowels or consonants only, with or without repeats.

Work out the sale price and how much you save: percent off, stacked discounts, sales tax, and the original price from a sale price.

Put any list in alphabetical order: A to Z or Z to A, ignore case or leading articles, natural number order, remove duplicates.

Count workdays between two dates or add business days to a start date, excluding weekends and optional holidays.

A searchable directory of useful Unicode symbols to copy and paste anywhere.

Convert foot-pounds (ft-lb) to Newton-meters (Nm) and vice versa for torque calculations.

Calculate the total fuel cost for any trip using distance, vehicle fuel efficiency and current gas prices.

Project the future value of an investment with compound interest and regular contributions.

Generate random last names and surnames for characters, stories, and writing projects instantly.

Calculate the gallons of paint required for your walls based on area, number of coats, and coverage per gallon.

A reference of star symbols to copy and paste, with Unicode code points, HTML entities and keyboard instructions for every platform.

Enter 11 or 12 digits to generate a scannable UPC-A barcode with computed check digit and full breakdown.

Explore JSON as a collapsible tree. Paste JSON and navigate nested structures with expand/collapse and JSONPath copy.

Copy invisible characters and blank text for names, messages and bios: zero-width space, Hangul filler, braille blank and more.

Convert acres to square feet and vice versa using the exact factor of 43,560 square feet per acre.

Compute cost per thousand impressions, total ad spend or total impressions by entering any two known values.

Convert volumes between cubic feet and US gallons instantly in your browser.

Convert milliseconds to seconds and seconds to milliseconds instantly in your browser.

Calculate your recommended daily protein intake in grams based on your body weight and fitness goal.

Generate one or more random animals instantly from a built-in list of over 150 species.

Compute the number of steps, rise per step, total run and stringer length for any staircase from a total height.

Estimate how much water to drink each day based on your weight, activity level and climate.

Convert text between camelCase, PascalCase, snake_case, kebab-case, SCREAMING_CASE, Title Case, sentence case, and more. Bulk mode.

Turn text into ᴛɪɴʏ small caps, ˢᵘᵖᵉʳˢᶜʳⁱᵖᵗ or ₛᵤbₛcᵣᵢₚₜ characters you can copy and paste into bios, posts and usernames.

Copy and paste check mark symbols, cross marks and ballot boxes with Unicode code points and keyboard shortcuts.

Calculate how many months it takes to pay off a credit card balance and the total interest charged at a given APR and monthly payment.

Convert angles between degrees and radians instantly by entering a value in either field.

Add combining Unicode marks to any text to create a creepy, distorted glitch effect you can copy and paste anywhere.

Convert pounds to grams and grams to pounds instantly with exact precision.

Enter a dividend and divisor to see the quotient, remainder and each subtraction step of the long division process.

Convert between US liquid quarts and US liquid gallons instantly with exact precision.

Generate one or more random colors with HEX, RGB and HSL values for design palettes and development.

Count syllables in words or sentences with a per-word breakdown and a built-in haiku checker.

Solve two linear equations with two unknowns by entering the coefficients for each equation.

Compute voltage drop over a wire run based on current, length, gauge and conductor material.

Calculate mechanical work in joules from force, distance and the angle between them.

Spell out any number in English words, plain, currency, check-writing (“and 56/100”) and ordinal. Up to 66 digits, decimals and negatives.

Percent-encode and decode URLs per RFC 3986.

Generate UUID v4 and v7 identifiers in bulk.

Test regular expressions with live match highlighting and explanation.

Format, validate, and beautify XML documents.

Convert Unix timestamps, epoch seconds/milliseconds, and ISO 8601 dates.

Turn text into glitchy Zalgo or cursed text with stacked combining marks. Control the intensity and direction, or clean Zalgo back to plain text.

Generate random phone numbers for testing in safe fictional ranges (US 555-01XX, UK Ofcom drama numbers) in any format.

Convert seconds to hours, minutes and seconds (HH:MM:SS) and back. Also days, weeks and decimal hours, with the math shown.

Convert cups to milliliters and back using the standard US legal cup definition for cooking and baking.

Enter the radius and height to get the volume, lateral area and total surface area of a cylinder instantly.

Generate random Japanese first and last names with kanji, romaji readings, and English meanings.

Validate JSON instantly in your browser. Find syntax errors, check structure, and view statistics without uploading data.

Solve linear equations with one or two variables step by step, showing the algebraic work.

Add, subtract, multiply matrices and compute determinants or inverses using a simple text-based grid input.

Convert speeds between mph, km/h, m/s and knots with a single input field.

Calculate gross profit margin from cost and revenue, or find the required selling price from cost and a target margin percentage.

Pick one or more random countries from a list of 195 recognized nations, instantly in your browser.

Paste a list of names and split them randomly into a chosen number of teams or teams of a specific size.

Solve for interest, principal, rate or time using the I = PRT formula by entering any three known values.

Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine instantly with this free browser-based tool.

Decode and inspect JSON Web Tokens. Local-only, tokens never leave your browser.

Full HTTP status code reference with explanations and when to use each.

Calculate alcohol by volume (ABV) from original and final specific gravity readings for beer, wine, or cider.

Estimate monthly car lease payments using the negotiated price, residual value, money factor and lease term.

Transform plain text into cursive, script, or handwriting-style Unicode fonts you can copy and paste anywhere.

Roll random fantasy character names for any D&D race. Pick a count and generate instantly in your browser.

Build a professional plain text email signature by entering your name, job title, company and contact information.

Calculate any base raised to any exponent, including fractions and negative powers, with instant results.

Enter distance and fuel used to calculate miles per gallon, kilometers per liter, and liters per 100 km instantly.

Find the selling price, cost or markup percentage from any two values you enter.

Convert milligrams to grams and back instantly by entering a value in either field.

Turn any name into cool or funny nicknames by picking a style and clicking generate.

Enter any positive integer to simplify its square root into exact radical form with step-by-step factorization.

Generate random everyday objects for drawing practice, classroom games or creative writing prompts.

Calculate simple ROI and annualized return on investment from cost, revenue and time period.

Calculate roof area in squares and estimate the shingles, bundles and underlayment needed based on footprint and pitch.

Add, subtract, multiply or divide two numbers in scientific notation and see the result in both scientific and standard form.

Count the number of sentences in any block of text instantly, along with words, characters and average sentence length.

Turn any text into tiny superscript or small caps Unicode characters you can copy and paste anywhere.

Calculate aspect ratios (16:9, 4:3, 21:9, etc.). Given W:H and one dimension, get the other. Responsive padding-top % for CSS aspect-ratio containers.

Compute the compound annual growth rate (CAGR) from a starting value, ending value and time period.

Translate any text into NATO phonetic spelling for clear radio and phone communication.

Enter any two of voltage, current, resistance or power to calculate the other two using Ohms law.

Convert pressure between psi and bar instantly by entering a value in either field.

Round any number to a specific number of decimal places, nearest integer, or significant figures instantly.

Enter two names to generate creative portmanteau couple ship names by blending their letters and syllables together.

Type any text and convert it to Unicode subscript characters you can copy and paste anywhere.

Type your text to generate Unicode superscript characters you can copy and paste into social media, documents or emails.

Flip any text upside down using Unicode character replacements. Type or paste, then copy the inverted result.

Estimate maximal oxygen uptake from resting and maximum heart rates using the Uth formula.

Convert weeks to approximate months and vice versa for project planning, pregnancy tracking, and scheduling.

Convert between YAML and JSON formats with full fidelity.

Live Markdown preview with GitHub-flavored syntax. Tables, task lists, code blocks, strikethrough. Side-by-side editor and rendered output.

Format and beautify SQL queries. 12 dialect options (PostgreSQL, MySQL, SQLite, MSSQL, BigQuery, Snowflake, and more). Keyword casing control.

Generate favicon package from any image or emoji. Multiple sizes (16, 32, 48, 180, 192, 512), manifest.json, and HTML snippet.

Calculate your monthly payment and generate a complete amortization schedule showing principal, interest and balance for every period.

Compute the radius, diameter, circumference and area of a circle from any single known measurement.

Solve for any unknown in the C1V1=C2V2 dilution equation by entering the other three values.

Find the exact midpoint coordinates between two points on a 2D plane by entering their x and y values.

Calculate single event, joint, union and conditional probabilities from two event inputs.

Generate random superhero names and secret alter egos with one click.

Compute ideal exercise heart rate zones using the Karvonen formula based on your age and resting heart rate.

Estimate the number of tiles needed for a floor or wall, including a waste factor for cuts and breakage.

Find the area of a triangle from its base and height, or from three side lengths using Heron's formula.

Enter a raw value, mean and standard deviation to compute the z-score and its approximate percentile.

Convert acres to hectares and back using the exact international conversion factor for land area measurements.

Generate random band names by genre with this free browser-based tool.

Calculate density, mass or volume by entering any two of the three values. Results update instantly as you type.

Convert any Eastern Time (ET) to Pacific Time (PT) with automatic daylight saving adjustments.

Generate realistic fake US addresses with random street names, cities, states and ZIP codes for testing and development.

Parse a string to JSON or stringify a JSON value with optional indentation, directly in your browser.

Evaluate the limit of common mathematical functions as x approaches a given value using this browser-based limit calculator.

Convert pressure between pascals (Pa) and pounds per square inch (PSI) instantly with this free browser-based calculator.

Enter your outs and remaining cards to get hit probability, odds ratio, and pot odds comparison for any poker street.

Discounts future cash flows to their present value using a discount rate and number of periods.

Generate random rap artist names using word combinations and classic hip hop naming patterns.

Find optimal bedtimes to wake up refreshed between 90-minute sleep cycles, accounting for the time it takes to fall asleep.

Add a list of numbers to get the total sum, count and average instantly.

Convert any text to proper title case using AP, Chicago or APA style rules instantly.

Convert watts to mechanical horsepower and back using the exact conversion factor, directly in your browser.

Convert CSV files to JSON with proper quoting and escaping.

Encode or decode text using the atbash cipher by reversing the alphabet, running entirely in your browser.

Generate creative book titles across various genres using word patterns and randomized combinations.

Calculate how many bricks and bags of mortar you need for a wall based on its dimensions and brick size.

Convert colors between HEX, RGB, RGBA, HSL and CMYK formats instantly by entering any valid color code.

Compute Pearson's r from paired X and Y data to measure linear relationship strength and direction.

Enter a date to find its day number (1 to 366) and how many days remain in the year.

Find the straight-line distance between two points in 2D or 3D space using the Euclidean distance formula.

Generate random male first names by count and style using this free mens name generator.

Type or paste text to convert it into Fraktur blackletter Unicode characters you can copy and use anywhere.

Convert pints to cups and cups to pints for US and UK kitchen measurements.

Generate random dates within a custom range, useful for birthdays, testing and sample data.

Instantly picks a random team from the 32 current NFL franchises.

Type or paste a string to reverse text character by character, including full support for emoji and special characters.

Convert numbers between scientific notation, decimal, e notation and engineering notation instantly in your browser.

Enter any two of speed, distance and time to instantly calculate the third using the standard formula.

Compute the volume and surface area of a sphere by entering its radius.

Type or paste text to instantly generate strikethrough characters you can copy and use anywhere online.

Calculate the volume of cylindrical, rectangular, and oval tanks in US gallons, UK gallons, or liters.

Convert tablespoons to milliliters and vice versa using the exact US tablespoon definition for precise recipe measurements.

Enter a value and unit to convert weight across metric and imperial systems including kg, g, lb, oz, stone, ton and tonne.

Calculate the minimum AWG wire gauge needed for a given current, distance, voltage and allowable voltage drop.

Convert px to rem, em, and percent, and vice versa. Configurable root font size. Bulk conversion mode for entire stylesheets.

Extract every email address and URL from a block of text. Regex-based, case-insensitive, deduplicated, sorted output.

Compare two JSON objects structurally with field-by-field diff.

Add, subtract, multiply or divide two binary numbers and see the result in binary and decimal.

Find the probability of exactly k successes in n trials for a binomial experiment.

Compute the chi-square statistic and p-value for a goodness of fit test using observed and expected frequencies.

Generate realistic or fantasy city names with geographic suffixes like -ton, -ville, and -burg for stories, games, and worldbuilding.

Compute confidence intervals for means or proportions at any confidence level directly in your browser.

Convert data transfer rates between Gbps, Mbps, MB/s, Kbps and other units instantly in your browser.

Convert energy values from electron volts (eV) to joules (J) using the exact elementary charge constant.

Convert data sizes between bytes, KB, MB, GB, TB and PB using binary or decimal standards.

Paste your text, enter a search pattern and replacement to find and replace matches instantly in the browser.

Convert plain text into italic Unicode characters you can paste anywhere on social media or messaging apps.

Finds the best-fit line equation, slope, intercept and R-squared for a set of data points using least squares.

Convert milliliters to cubic centimeters instantly. One mL is exactly one cc, so the value stays the same.

Convert percent to decimal and decimal to percent instantly in your browser.

Enter the length, width, and depth of your raised garden bed to calculate the exact soil volume needed in cubic feet and cubic yards.

Draw one or more random playing cards from a standard 52-card deck instantly in your browser.

Generate random conversation starters and icebreaker questions by category, running entirely in your browser.

Generate one or more random sentences instantly in your browser for placeholder text, writing prompts or testing.

Picks one or more random US states from the full list of fifty states instantly in your browser.

Get instant conversation starters, writing prompts, and discussion topics from a built-in list of over 100 ideas.

Round numbers to a specified count of significant digits and see the result with scientific notation.

Enter your options, spin the virtual wheel, and let randomness decide for you.

Compute mean absolute deviation, standard deviation, variance and RSD from comma-separated numbers directly in your browser.

Generate sports, fantasy, work and trivia team names instantly with one click.

Convert metric tons to kilograms and back for heavy weights, with instant results as you type.

Calculate population and sample variance, standard deviation, and mean for any list of numbers.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes client-side.

Generate acronyms and abbreviations from any phrase with initials, creative word picks and multiple options.

Convert bits to bytes and back instantly, with results shown in kilobytes, megabytes and more.

Convert feline years into approximate human age equivalents instantly.

Calculate the number of combinations (n choose k) for any valid set size and selection count.

Generate fictional country names in fantasy, sci-fi or historical styles using syllable combinations and common suffixes.

Calculate the cross product of two 3D vectors with magnitude and unit vector output.

Compute the determinant of any square matrix up to 5x5 by entering the entries row by row.

Compute eigenvalues and eigenvectors for 2x2 and 3x3 square matrices directly in your browser.

A reference list explaining the meaning of face emojis, from happy smileys to confused expressions.

Compute n factorial, double factorial, permutations and combinations with exact BigInt precision for any non-negative integer.

Generate random family surnames for characters, stories, or world-building with selectable origins and counts.

Convert fractions to percentages and percentages to simplified fractions instantly in your browser.

A quick reference grid of all 24 uppercase and lowercase Greek letters with Unicode code points and HTML entities for easy copying.

Arithmetic and bitwise operations on hexadecimal numbers, with decimal equivalents shown for every result.

Paste a JSON array of objects to convert it into CSV format with custom delimiters.

Enter mass and velocity to calculate kinetic energy in joules, kilojoules, calories and electron-volts.

Paste text to count total lines, non-empty lines, blank lines, words and characters instantly.

Convert plain text into bold, italic, or styled Unicode text optimized for LinkedIn posts.

Calculate the internal volume of a pipe given its inside diameter and length, with results in multiple units.

Generate random story plots complete with characters, conflict and resolution to spark your next writing project.

Generate one or more random food and meal ideas from a built-in list of dishes, snacks, and cuisines.

Generate random nouns by category for writing prompts, drawing challenges, or brainstorming sessions.

Generate random alphanumeric strings of custom length for tokens, keys and test data directly in your browser.

Generate valid-format random US ZIP codes for testing, development and sample data.

Select band colors to decode any 4, 5 or 6 band resistor into its resistance value and tolerance.

Translate shoe sizes between US men, US women, UK, EU and foot length in centimeters.

Compute t-statistics and p-values for one-sample, independent two-sample and paired t-tests directly in your browser.

Enter points earned and total points to get the percentage, letter grade, and points missed on any exam or assignment.

Convert hours and minutes into decimal hours for payroll, billing or math calculations.

Parse any User-Agent string into browser, OS, device, and engine. Or detect your own. Built on the maintained ua-parser-js dataset.

Build and parse cron expressions with human-readable explanations.

Convert pressure between standard atmospheres (atm) and kilopascals (kPa) instantly in your browser.

Turn normal text into bold Unicode characters you can paste directly into Facebook posts, comments and profiles.

Enter the radius and height to get the volume, surface area and slant height of a right circular cone.

Convert days to hours and hours to days instantly by typing a value into either field.

Compute straight-line or declining balance depreciation for any asset by entering cost, salvage value and useful life.

Estimate the running cost of any appliance from its wattage, hours of use and your electricity rate.

Calculate total engine displacement from bore diameter, stroke length and number of cylinders in cc, liters or cubic inches.

Turn plain text into bold, italic, script and other Unicode font styles for social media, chat apps and profiles.

Calculate the water volume of a rectangular or cylindrical fish tank in US gallons, UK gallons, and liters.

Estimate carpet, tile, or hardwood needed for a room by entering dimensions and waste percentage.

Convert letters to numbers (A=1, B=2) and numbers back to letters with this free A1Z26 tool.

Estimate customer lifetime value based on average order value, purchase frequency and retention rate.

Calculate the remainder of dividing one number by another with this fast modulo calculator.

Convert fuel economy from miles per gallon to liters per 100 kilometers for US or UK gallons.

Enter raw digits and a country code to format phone numbers into E.164, national, international and RFC3966 styles.

Add, subtract, multiply, divide and factor single-variable polynomials instantly in your browser.

Generate random latitude and longitude coordinates anywhere on Earth with a single click.

Generate a random superpower with a built-in limit and weakness for characters, stories and games.

Estimate how long a text takes to read based on word count and words per minute.

Estimate surfboard volume in liters from length, width, thickness and board shape.

Repeat any word, phrase or block of text a specific number of times with a custom separator.

Enter the two parallel bases and the height to calculate the area of a trapezoid instantly.

Check XML syntax, matching tags and well-formedness directly in your browser.

Find all unique expressions that equal 24 from four numbers using basic arithmetic operations.

Convert angstroms to nanometers instantly for crystallography, chemistry, and atomic-scale measurements.

Turn plain words into large ASCII art text with multiple block-letter styles you can copy anywhere.

Type a phrase and get the CSS and HTML to recreate the lime-green Brat album cover aesthetic.

Convert raw bytes to kilobytes and back for file sizes, supporting both decimal (SI) and binary (IEC) standards.

Compute sales commission earnings from a sale amount and rate, with optional base salary for total compensation.

See how automatic dividend reinvestment compounds your investment over time with this free browser-based calculator.

Generate popular and unique dog name ideas for your new puppy with one click.

A reference of floral and plant Unicode symbols ready to copy and paste into any text field or document.

Calculate the remaining amount of a substance after radioactive decay given the initial quantity, half-life and elapsed time.

Paste a hexadecimal string to decode it into readable plain text, supporting spaces, commas, and UTF-8 characters.

Compute log base 10, natural log, or any base for a given number directly in your browser.

Generate sets of random lottery numbers based on custom rules like range, count and number of tickets.

Reverse the characters in any string instantly with this free mirror text generator that runs in your browser.

Combine your topic, tone and format to generate unique podcast name ideas instantly in your browser.

Generate one or more random times of day in 12-hour or 24-hour format, directly in your browser.

Convert RGB screen colors to CMYK print percentages for accurate color reproduction.

Calculate the slope intercept form (y = mx + b) of a line from two points or from a known slope and point.

Paste your text and select a speaking pace to estimate how many minutes and seconds it will take to deliver aloud.

Compare times across up to five cities and find overlapping business hours for your next global meeting.

Visual CSS Flexbox playground. Live preview + copyable CSS. Control direction, wrap, justify, align, gap. Example child layouts.

Visual CSS Grid layout builder. Configure columns, rows, gaps, and named areas. Live preview with copyable CSS output.

Convert binary strings to hexadecimal and hex values back to binary with this free browser-based tool.

Convert thermochemical calories to joules and vice versa. Enter a value in either unit to get an instant energy conversion.

Generate dark, occult-sounding demon names using Latin roots and harsh consonants for fiction, games and worldbuilding.

Generate whimsical, nature-inspired fairy names for stories, games and characters with one click.

Compute force, mass or acceleration using Newton's second law (F = ma). Enter any two values to solve for the third.

Format and indent messy or minified HTML code for better readability directly in your browser.

Convert normal English text into 1337 leetspeak using letter-to-number substitutions, entirely in your browser.

Convert any Mach number to miles per hour, kilometers per hour and knots instantly in your browser.

Enter nouns, verbs, and adjectives to generate a funny fill-in-the-blank story instantly.

A clickable grid of common mathematical Unicode symbols to copy and paste into documents, equations, or web pages.

Convert a metric tire size such as 265/70R17 into section width, sidewall height, overall diameter and circumference in inches.

Turn any text into blocky Minecraft-style pixel letters using Unicode block characters.

Convert nautical miles to kilometers for maritime and aviation distances using the exact international standard factor.

Convert between US pints, UK imperial pints, and liters for beverage and recipe volume measurements.

Combine nautical adjectives and notorious nouns to generate swashbuckling pirate aliases instantly in your browser.

Convert parts per million (ppm) to percentage and vice versa for gas, liquid or solid concentrations.

Generate fake random IPv4 or IPv6 addresses for software testing, network configuration and development.

Joins multiple lines of text into a single continuous paragraph by removing line breaks.

Copy the shrug emoji text ¯\_(ツ)_/¯ and its popular variations to your clipboard with a single click.

Convert square miles to square kilometers and back using the exact factor of 2.589988110336.

Convert tablespoons to teaspoons and vice versa for cooking measures.

Interactive conversion unit table for weight, volume, length and temperature with exact factors and live calculation.

Generate evil and intimidating names for fictional villains across multiple styles.

Convert solar system distances from astronomical units (AU) to kilometers using the exact IAU definition.

Convert gemstone carat weight to metric grams, milligrams and ounces instantly.

Convert Central Standard Time (CST) to Indian Standard Time (IST) by entering an hour and minute.

Solve PV=nRT for any missing variable by entering the other three values.

Compacts JSON data by removing all extraneous whitespace characters for smaller payloads.

Browse categories of Japanese text emoticons or generate a random kaomoji to copy into your chats and posts.

Convert kilowatt-hours to joules and vice versa for electrical energy calculations.

Convert metric tons to pounds and vice versa instantly with exact results.

Convert between pH and hydrogen ion concentration instantly, with pOH and acidity status included.

Generate random names that sound like Pokémon species for games, stories, or fun.

Click to reveal an interesting random fact from a built-in collection of science, history, animals and more.

Convert ratios to simplified fractions and fractions to ratios instantly with this free browser-based tool.

Enter length and width to instantly get the area, perimeter and diagonal of any rectangle.

Brainstorm creative names for restaurants, cafes, bistros and diners by selecting a cuisine, vibe and naming format.

Generate formatted fake Social Security Numbers for software testing and development, avoiding all reserved ranges.

Calculate target split times per lap for any swimming distance based on your goal time or pace.

Calculate rotational force (torque) from applied force and lever arm distance with unit conversion.

Suggests catchy YouTube channel name ideas by combining your topic, keywords and naming styles.

Minify HTML, CSS, or JavaScript. Strips whitespace, comments, and unnecessary characters. Shows size reduction percentage.

Produces bizarre, unpronounceable alien names using apostrophes and unusual consonant clusters for your sci-fi projects.

Calculate board feet from thickness, width, length and piece count with this free lumber calculator.

Turn normal text into circled Unicode bubble characters you can copy and paste anywhere.

Suggests cute and funny names for pet cats based on the style you pick.

Convert Central Time to Eastern Time and back with automatic DST handling and date change display.

Tick read, write and execute for owner, group and other to get octal, symbolic and the full chmod command.

Encode text and numbers into a Code 128 barcode SVG with automatic code set B and C switching.

Enter impressions and clicks to calculate click-through rate (CTR) as a percentage instantly.

Convert American, decimal and fractional odds to implied probability and calculate the bookmaker margin for multi-outcome events.

Look up forward and inverse Laplace transforms for standard mathematical functions directly in your browser.

Convert leagues to statute miles using land, nautical or historical definitions for literature and geography.

Convert parts per million to parts per billion and vice versa for trace concentration measurements.

Generate random placeholder paragraphs for design mockups, wireframes and testing with adjustable length.

Generate gothic, aristocratic vampire names using European roots for fiction, tabletop RPGs, and character creation.

Compute real, apparent and reactive power plus current for balanced three-phase AC circuits from line voltage, amps and power factor.

Compute Ix, Iy and section modulus for common beam cross sections from dimensions.

Compute the per-mile and percentage fuel surcharge for trucking from diesel price, base price and MPG.

Convert furlongs to miles and vice versa for horse racing distances and land measurement.

Convert newtons to pounds force (lbf) and vice versa for physics and engineering calculations.

Convert Pacific Time to India Standard Time and back with automatic daylight saving adjustment.

Convert years to months and back for long-term durations, with support for fractional values.

Compute sector area, arc length, chord length and segment area from radius and central angle.

Compute exact and cumulative Poisson probabilities, mean and variance for a given rate parameter lambda and number of events k.

Visual CSS box-shadow builder. Control offset, blur, spread, color, inset. Multi-layer shadows. Live preview + copyable CSS.

Create Code 39 barcodes as SVG with optional modulo 43 check digit, adjustable height and human-readable text.

Calculate lawn area from mixed shapes and determine the number of sod rolls or pallets needed, including waste allowance.