Feet to inches
in = ft × 12
Exact ratio: 1 ft = 12 in.
Convert feet to inches (and inches to feet)
Two-way feet ↔ inches converter: exact ratio (1 ft = 12 in), decimal feet or feet and inches, formulas, a conversion table and real examples (5′9″ height, 8 ft ceiling, 6′8″ standard door).
Conversion table
| ft | in |
|---|---|
| 1 ft | 12 in |
| 2 ft | 24 in |
| 5 ft | 60 in |
| 10 ft | 120 in |
| 20 ft | 240 in |
| 50 ft | 600 in |
| 100 ft | 1,200 in |
| 1,000 ft | 12,000 in |
| in | ft |
|---|---|
| 1 in | 0.08333 ft |
| 2 in | 0.1667 ft |
| 5 in | 0.4167 ft |
| 10 in | 0.8333 ft |
| 20 in | 1.66667 ft |
| 50 in | 4.16667 ft |
| 100 in | 8.33333 ft |
| 1,000 in | 83.3333 ft |
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How does this tool work?
This converter turns feet into inches and inches into feet: type a value in either field and the other updates instantly. It is mostly used to read US and UK heights and dimensions: a person's height (5′9″), the height of a ceiling or a door, the length of a board or a cable, or the size of a piece of furniture, where feet and inches are often written together or as decimal feet.
Feet and inches are linked by an exact ratio: 1 foot = 12 inches, so 1 inch = 1/12 foot ≈ 0.083333 foot. Both are tied to the metric system by the 1959 international yard and pound agreement: 1 foot = 0.3048 m exactly and 1 inch = 25.4 mm exactly.
To go from feet to inches, multiply by 12; to go from inches to feet, divide by 12. For a measurement in feet and inches such as 5′9″, the formula is inches = 5 × 12 + 9 = 69 inches. For a number of inches such as 69, the feet are the whole part of 69 ÷ 12 (5) and the inches are the remainder (9).
For a quick estimate, multiply feet by 10 then add 20%: 6 ft ≈ 60 + 12 = 72 in. To get a height in centimeters, remember 1 ft ≈ 30.5 cm and 1 in ≈ 2.5 cm: 5′9″ ≈ 152.5 + 22.5 = 175 cm.
Watch out for decimal feet: 5.5 ft is indeed 5 ft 6 in, but 5.6 ft is 5 ft 7.2 in (0.6 × 12), not 5 ft 6 in. The two notations are not interchangeable. The symbols ′ (foot) and ″ (inch) should not be confused with arcminutes and arcseconds, which are written the same way.
How to use this tool
Enter feet or inches
In decimal feet or in inches; for 5′9″, enter 69 inches or 5.75 feet.
Read the conversion
The other field updates on every keystroke, using the exact ratio of 12 inches per foot.
Scan the chart
Below the converter, the table lists common equivalents in both directions, handy for spotting a height or a ceiling.
Feet ↔ inches conversion formulas
The ratio between feet and inches is exact: 12 inches per foot. Decimal feet and the feet-and-inches notation convert with the same formula.
Inches to feet
ft = in ÷ 12
The result is decimal: 69 in = 5.75 ft.
Feet and inches to inches
in = ft × 12 + r
For 5′9″: 5 × 12 + 9 = 69 inches.
- ft
- length in feet
- in
- length in inches (1 inch = 25.4 mm)
- r
- inches to add to the whole feet in a feet-and-inches notation
Example: 5′9″ = 5 × 12 + 9 = 69 inches = 5.75 feet = 69 × 25.4 = 1,752.6 mm, or 175.26 cm.
Use cases
Body height
Go from a US or UK height in feet and inches to a number of inches, then to centimeters.
DIY and construction
Read the dimensions of a plan, a piece of furniture, a window or lumber given in feet and inches.
Cables and LED strips
Convert the length of a cable or an LED strip sold by the foot into inches.
Sports and leisure
Make sense of jump heights, hoop and net heights, or a player's height in feet and inches.
Examples
Height of 5′9″
5 feet 9 inches = 5 × 12 + 9 = 69 inches, which is 5.75 feet and 175.26 cm (69 × 2.54).
Input
5.75 feetResult
69 inches8 ft ceiling
8 × 12 = 96 inches, or 243.84 cm: the standard ceiling height in American homes.
Input
8 feetResult
96 inchesStandard door
80 ÷ 12 ≈ 6.667 ft, which is 6 feet 8 inches (6′8″) or 203.2 cm.
Input
80 inchesResult
6.667 feetThe decimal feet trap
5.6 × 12 = 67.2 inches, which is 5 ft 7.2 in and not 5′6″, which would be 66 inches.
Input
5.6 feetResult
67.2 inches100-inch board
100 ÷ 12 ≈ 8.333 ft, which is 8 feet and 0.333 × 12 = 4 inches (8′4″).
Input
100 inchesResult
8.333 feetTips and best practices
- Landmarks: 1 foot = 12 inches = 30.48 cm; 6 feet = 72 inches = 182.88 cm.
- To turn inches into feet and inches: divide by 12, the whole part gives the feet and the remainder the inches (70 inches = 5′10″).
- Decimal inches in the result can be turned into fractions: 0.5 = 1/2, 0.25 = 1/4, 0.75 = 3/4, with the fraction calculator.
- To go to meters or centimeters, use the meters to feet converter or the cm to inches converter.
Sources and references
Frequently asked questions
How many inches are in a foot?
A foot is exactly 12 inches. This ratio is exact, unlike conversions to the metric system, which rely on 1 inch = 25.4 mm.
How many inches is 5 feet 9 inches?
5 × 12 + 9 = 69 inches, which is 175.26 cm. In decimal feet, 69 ÷ 12 = 5.75 feet.
How do I convert feet to inches?
Multiply the feet by 12. For example, 3 ft = 36 in, 6 ft = 72 in and 6.5 ft = 78 in.
How many feet is 100 inches?
100 ÷ 12 ≈ 8.333 feet, which is 8 feet 4 inches (8′4″). In meters, 100 inches = 2.54 m.
What do the ′ and ″ symbols mean?
The ′ (prime) mark stands for feet and the ″ (double prime) mark for inches: 6′2″ reads "six feet two inches" and equals 74 inches, or 187.96 cm.
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