What this calculator does
Change inches to feet, or feet to inches, in a moment. Both units come from the same US system, so there's no metric step in between: a foot is exactly 12 inches. People still switch between them all the time. Heights, TV stands, room sizes and lumber often get quoted in one unit and measured in the other.
To change inches into feet, divide by 12. To change feet into inches, multiply by 12. The answer here is in decimal feet, so 66 in shows as 5.5 ft. The notes below show how to write that as 5 ft 6 in.
Where it's used
Why this math matters outside the classroom:
- Height. Pediatric height charts record a child who is 52 in tall as 4 ft 4 in.
- Lumber. Carpenters cutting from a 96 in board know they have exactly 8 ft of length to work with.
- Shelf space. A 65 in wide shelf is 5 ft 5 in, or about 5.42 ft.
- Snowfall. A storm that drops 30 in of snow has dropped 2.5 ft.
- Room layouts. Students convert 3 ft 8 in to 44 in to subtract it from a 10 ft wall measured as 120 in.
Grade level and standards: Grades 4–5; Common Core State Standards for Mathematics 4.MD.A.1, 5.MD.A.1. © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
How to use it
- Enter the number of inches, or the number of feet as a decimal.
- Pick inches → feet or feet → inches.
- Read the answer and the steps. The table lists common heights and lengths in both units.
What the inputs mean
- Value to convert
- A length in inches (in → ft) or decimal feet (ft → in). For 5 ft 9 in going to inches, enter 5.75 ft.
- Direction
- Choose the unit you have.
Formula and method
ft = in ÷ 12 in = ft × 12
In the formulas, ft is the length in feet and in is the length in inches. The foot has been split into 12 inches for centuries. Agreed definitions from 1959 kept that ratio and tied both units to the meter: 1 in = 2.54 cm and 1 ft = 30.48 cm.
Twelve divides evenly in many ways. So a quarter, a third and a half of a foot all come out as whole inches (3, 4 and 6). That's one reason the ratio has lasted.
Worked example
Someone is 72 inches tall. How many feet is that?
- Divide by 12 inches per foot: 72 ÷ 12.
- 72 ÷ 12 = 6.
Result: 72 inches is exactly 6 feet.
Understanding the result
To split decimal feet into feet and inches, keep the whole number as feet. Then multiply the decimal part by 12 to get the inches. For 5.75 ft: 5 ft plus 0.75 × 12 = 9 in, so 5 ft 9 in. Going the other way, 5 ft 9 in is 5 × 12 + 9 = 69 in.
Some common values: 30 in (a typical desk height) is 2.5 ft. 36 in is 3 ft, or one yard. 48 in is 4 ft, the width of a standard sheet of plywood, and 96 in is 8 ft, its length. A 64-inch person is 5 ft 4 in.
Watch out for this common slip: writing 5.10 ft for 5 ft 10 in. As decimal feet, 5.10 ft is only 5 ft 1.2 in; 5 ft 10 in is 5.8333 ft. Writing it with marks, 5′10″, avoids the mix-up.
Assumptions and limitations
- Both are the standard international units: 1 ft = 12 in = 0.3048 m.
- Values are plain lengths.
- The answer is in decimal feet, not feet and inches. Use the rule above to split it.
- Square inches to square feet uses 144, not 12. This page handles length only.
Frequently asked questions
How many inches are in a foot?
Exactly 12.
How many feet is 100 inches?
8.3333 ft, which is 8 ft 4 in.
How many square inches are in a square foot?
144, because a square foot is 12 in × 12 in. Area conversions always use the length number multiplied by itself.
What does a double prime (″) mean?
It marks inches, while a single prime (′) marks feet. So 6′2″ means 6 feet 2 inches, which is 74 in.
How this calculator is checked
Method: Customary definition 1 ft = 12 in, both fixed to the meter by the 1959 international agreement. The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.
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