How to use the inches to feet converter
- Enter the length in inches using the number field. The tool accepts whole numbers, decimals, and values like 0.375 for 3/8 inch.
- Read the decimal feet value for calculations, spreadsheets, or CAD input. This is the inches to feet result expressed as a single number.
- Read the feet-and-inches value for real-world measurements, construction layouts, or height references. This format matches how tape measures are marked.
- Copy whichever format you need. The tool updates instantly as you type, so you can test multiple values quickly.
How the inches to feet conversion works
The relationship is defined exactly: 1 foot = 12 inches. This definition has been fixed by international agreement since 1959, when the US and Commonwealth nations standardized the yard as exactly 0.9144 meters, making the foot exactly 0.3048 meters and the inch exactly 25.4 millimeters.
To convert inches to decimal feet, divide the inch value by 12. For example, 70 inches ÷ 12 = 5.833333... feet. The division often produces a repeating decimal because 1/12 = 0.08333... does not terminate in base 10.
To express the result as feet and inches, take the whole number of feet (5) and multiply the fractional part by 12: 0.833333... × 12 = 10 inches. So 70 inches = 5 ft 10 in. The tool performs both calculations automatically and rounds the decimal feet to six places for readability while keeping the feet-and-inches exact.
Quick reference table for inches to feet
Common inch values and their foot equivalents for fast lookup:
| Inches | Decimal feet | Feet & inches |
|---|---|---|
| 1 | 0.08333 | 0 ft 1 in |
| 2 | 0.16667 | 0 ft 2 in |
| 3 | 0.25 | 0 ft 3 in |
| 4 | 0.33333 | 0 ft 4 in |
| 6 | 0.5 | 0 ft 6 in |
| 8 | 0.66667 | 0 ft 8 in |
| 9 | 0.75 | 0 ft 9 in |
| 12 | 1 | 1 ft 0 in |
| 18 | 1.5 | 1 ft 6 in |
| 24 | 2 | 2 ft 0 in |
| 30 | 2.5 | 2 ft 6 in |
| 36 | 3 | 3 ft 0 in |
| 48 | 4 | 4 ft 0 in |
| 60 | 5 | 5 ft 0 in |
| 72 | 6 | 6 ft 0 in |
Decimal feet vs feet and inches
Decimal feet (5.8333 ft) are convenient for spreadsheets, CAD, and further math because they behave like any other decimal number. You can add, subtract, multiply, and divide them directly.
Feet-and-inches (5 ft 10 in) match how people speak and how tape measures are marked in the US. Carpenters, framers, and DIYers read this format natively. Converting between the two by hand is error-prone: the fractional part of decimal feet must be multiplied by 12, not treated as inches directly. For instance, 5.5 ft is 5 ft 6 in, not 5 ft 5 in.
This inches to feet tool shows both formats side by side so you can copy the one you need without mental arithmetic or transcription mistakes.
Common mistakes when converting inches to feet
- Confusing the symbol
"(inches) with'(feet). Remember: the double quote looks like two small marks for the smaller unit. - Treating decimal feet as feet-and-inches. For example, 5.5 ft is 5 ft 6 in, not 5 ft 5 in. The digits after the decimal point are tenths of a foot, not inches.
- Using 10 inches per foot (a decimal carry error). Always use 12.
- Forgetting that area conversions use 144 (12²), not 12. Square inches to square feet is a different calculation.
- Mixing US survey feet with international feet. The difference is two parts per million and only matters for high-precision survey work over long distances.
Practical use cases for inches to feet conversion
- Construction and carpentry: Lumber is sold by the foot but cut lists often use inches. Converting 92-5/8 inch studs to 7.7083 feet helps with material estimation.
- Height measurements: Medical forms and ID documents often ask for height in feet and inches. A person who is 70 inches tall is 5 ft 10 in.
- Interior design: Room dimensions in inches from a laser measure convert to feet for furniture planning and flooring calculations.
- Engineering and CAD: Drawings may use decimal feet for coordinate input while shop drawings use feet-and-inches for fabrication.
- Sports: Track and field events like high jump and pole vault use metric internationally but feet-and-inches in US meets. Converting 12 ft 6 in to 12.5 ft helps compare records.
Worked examples
| Example | Input | Result |
|---|---|---|
| One foot exactly | Inches: 12 | Feet (decimal): 1; Feet & inches: 1 ft 0 in |
| Two feet | Inches: 24 | Feet (decimal): 2; Feet & inches: 2 ft 0 in |
| Height: 5 ft 10 in | Inches: 70 | Feet (decimal): 5.833333; Feet & inches: 5 ft 10 in |
| Half inch | Inches: 0.5 | Feet (decimal): 0.041667; Feet & inches: 0 ft 0.5 in |
| Twelve feet | Inches: 144 | Feet (decimal): 12; Feet & inches: 12 ft 0 in |
FAQ
How many inches in a foot?
Exactly 12 inches. This is the international foot definition used in the US and UK since 1959.
How do I convert feet to inches?
Multiply the feet value by 12. For 5.5 feet: 5.5 × 12 = 66 inches. The reverse of inches to feet is just multiplication instead of division.
What is 5 feet 10 inches in decimal feet?
5 + (10 ÷ 12) = 5.833333... feet. The tool shows this instantly when you enter 70 inches.
Why does the decimal repeat for many inch values?
Because 1/12 = 0.08333... is a repeating decimal in base 10. The tool rounds to six decimal places for readability while the feet-and-inches result stays exact.
Is this the US survey foot or the international foot?
The international foot (exactly 0.3048 meters). The US survey foot (1200/3937 m) differs by two parts per million and is only used for legacy survey data.
Can I convert fractions of an inch like 3/8?
Yes. Enter the decimal equivalent (0.375) or type the fraction and the browser will parse it in the number field. The inches to feet result will show both decimal feet and the fractional inch remainder.
Does this work for square inches to square feet?
No. Area conversion divides by 144 (12²). Use the square inches to square feet tool for that.