How to use the unit conversion table
- Select a category from the dropdown: weight, volume, length or temperature.
- Enter the numeric value you want to convert.
- Choose the source unit from the list.
- Read the results in the table below, which updates automatically as you type.
How unit conversions work
Every conversion in this table uses a single multiplication factor against a base unit. For weight the base is the kilogram, for volume the liter, and for length the meter. To convert between any two units the tool first converts the input to the base unit, then divides by the target unit's factor.
For example, converting 5 pounds to grams: one pound equals exactly 0.45359237 kilograms, so 5 lb is 2.26796185 kg. Since one gram is 0.001 kg, dividing gives 2,267.96185 g. Temperature is the exception because Celsius, Fahrenheit and Kelvin have different zero points, requiring addition or subtraction alongside multiplication.
Weight and mass reference
The following factors define every weight unit relative to one kilogram. These are exact definitions used in international standards.
| Unit | Equals 1 kg |
|---|---|
| Gram (g) | 1,000 g |
| Milligram (mg) | 1,000,000 mg |
| Metric ton (t) | 0.001 t |
| Pound (lb) | 2.204623 lb |
| Ounce (oz) | 35.27396 oz |
One pound is defined as exactly 0.45359237 kg. One ounce is one sixteenth of a pound. If you need to convert larger industrial quantities, the metric tonne conversion to pounds page handles that specific case.
Volume reference
Volume conversions use the liter as the base. US customary and UK imperial gallons differ significantly, which is a frequent source of errors.
| Unit | Equals 1 L |
|---|---|
| Milliliter (mL) | 1,000 mL |
| US gallon | 0.264172 gal |
| UK gallon | 0.219969 gal |
| US cup | 4.226753 cups |
| US fluid ounce | 33.81402 fl oz |
| US tablespoon | 67.62805 tbsp |
| US teaspoon | 202.8841 tsp |
A US gallon is exactly 3.785411784 liters while a UK gallon is exactly 4.54609 liters. Always verify which gallon your recipe or specification requires before converting.
Length and distance reference
All length units here trace back to the meter through exact definitions established by international agreement.
| Unit | Equals 1 m |
|---|---|
| Centimeter (cm) | 100 cm |
| Millimeter (mm) | 1,000 mm |
| Kilometer (km) | 0.001 km |
| Mile (mi) | 0.000621 mi |
| Yard (yd) | 1.093613 yd |
| Foot (ft) | 3.28084 ft |
| Inch (in) | 39.37008 in |
One inch is exactly 2.54 centimeters, one foot is 12 inches, one yard is 3 feet and one mile is exactly 1.609344 kilometers. These fixed ratios mean conversions never involve rounding at the definition level.
Common mistakes to avoid
The most frequent error in unit conversion is mixing up US and UK gallons. A UK gallon holds about 20 percent more liquid than a US gallon, so using the wrong factor throws off recipes, fuel calculations and chemical mixtures. Another common issue is treating temperature like a simple ratio. You cannot multiply Celsius by a factor to get Fahrenheit because the scales start at different points. Use the formulas provided in this conversion unit table rather than guessing.
Finally, watch out for confusing mass and weight in everyday language. In science mass is measured in kilograms while weight is a force measured in newtons. This table treats pounds and kilograms as units of mass for practical everyday use, matching how most people encounter them in cooking, shipping and commerce.
Worked examples
Each result below was produced by the same code the tool runs, so you can check your own numbers against them.
| Example | Input | Result |
|---|---|---|
| 5 kilograms to other weights | Category: weight; Value to convert: 5; From unit: kg | Grams: 5,000; Milligrams: 5,000,000; Metric tons: 0.005; Pounds: 11.023113; Ounces: 176.36981 |
| 2 US gallons to other volumes | Category: volume; Value to convert: 2; From unit: usgal | Liters: 7.570824; Milliliters: 7,570.8236; UK gallons: 1.665348; US cups: 32; US fluid ounces: 256; US tablespoons: 512; US teaspoons: 1,536 |
| 10 miles to other lengths | Category: length; Value to convert: 10; From unit: mi | Meters: 16,093.44; Centimeters: 1,609,344; Millimeters: 16,093,440; Kilometers: 16.09344; Yards: 17,600; Feet: 52,800; Inches: 633,600 |
| 100 degrees Celsius | Category: temperature; Value to convert: 100; From unit: c | Fahrenheit: 212; Kelvin: 373.15 |
FAQ
What is a conversion unit table?
A conversion unit table lists the multiplication factors needed to change a measurement from one unit to another. It covers categories like weight, volume, length and temperature.
Why are US and UK gallons different?
The US gallon is based on the historical Queen Anne wine gallon of 231 cubic inches, equaling 3.785411784 liters. The UK imperial gallon was redefined in 1824 as the volume of 10 pounds of water, equaling 4.54609 liters.
Is a pound exactly 0.45359237 kilograms?
Yes. Since 1959 the international avoirdupois pound has been defined as exactly 0.45359237 kg by agreement among English-speaking nations.
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 and then add 32. For example, 20 degrees C times 9/5 is 36, plus 32 equals 68 degrees F.
Does this tool work offline?
Yes. Once the page loads, all calculations happen locally in your browser without sending data to any server.
Are these conversion factors exact?
The factors for weight, volume and length are based on exact international definitions. Displayed numbers may be rounded to six decimal places for readability, but the underlying math uses full precision.