Convert feet to inches (ft to in)
To convert feet to inches, multiply the value in feet by 12. It is the simplest imperial conversion but easy to slip on when you mix decimals and fractions — 5.5 ft is 66 inches, not 55. This feet to inches converter works both ways: type feet or inches into either box above and the other box, the worked formula and the chart below update as you type.
The foot (ft or ′) equals 12 inches. Originally based on the length of a human foot, it was standardized in 1959 as exactly 0.3048 meters. Feet are used for people’s height in the US, UK, Canada and India, for room and property sizes in the US, and for aircraft altitude in most of the world. One foot is 12 inches.
The inch (in or ″) is a unit of the imperial and US customary systems. Its name comes from the Latin uncia, “one twelfth”, and since the 1959 international yard and pound agreement it has been exactly 25.4 millimeters. Going the other way, one inch equals 0.0833333 feet. Inches measure TV, laptop and phone screens worldwide, as well as height, waist sizes, wheel rims and timber in the US.
How to convert feet to inches with this tool
- Type a number into the Feet (ft) box — it starts at 5.5 ft as an example.
- Read the answer in the Inches (in) box and in the result panel, which also shows the formula with your number.
- To go the other way, type into the inches box, or press the swap button to open the Inches to Feet converter with your value carried over.
- Choose how many decimal places you want, or tap a quick value such as 2.5 ft, 3 ft, 5.5 ft.
- Press Copy result to paste the conversion into a message, spreadsheet or note.
Feet to Inches converter features
Converts both ways
Type in the feet box to get inches, or in the inches box to get feet. The other box follows instantly.
Exact factor
Calculations use 1 ft = 12 in, and rounding is applied only to the answer you see — choose Auto or 0–10 decimal places.
Formula with your number
The working is shown under the result, for example 5.5 ft × 12 = 66 in, so you can check it or copy the method.
Quick values and chart
Tap common values like 2.5 ft, 3 ft, 5.5 ft, or read the feet-to-inches table further down this page.
Feet to Inches formula
The formula is in = ft × 12. It is exact because a foot is defined as exactly 12 inches.
The reverse formula is ft = in ÷ 12 — or use the Inches to Feet converter. Three worked examples:
- Five and a half feet: 5.5 ft × 12 = 66 in
- Six and a quarter feet: 6.25 ft × 12 = 75 in
- One yard (3 ft): 3 ft × 12 = 36 in
Feet to Inches quick reference
The values people look up most often, worked out with the exact factor:
- 1 ft = 12 in
- 1 in = 0.0833333 ft
- 2.5 ft = 30 in
- 3 ft = 36 in
- 5.5 ft = 66 in
- 6 ft = 72 in
Quick tip: For decimal feet, multiply by 12. For feet and inches, multiply the feet by 12 and add the inches: 5 ft 9 in = 60 + 9 = 69 in.
Related conversions: CM to Inches, MM to Inches and the full length converter.
Feet to Inches conversion table
Values in inches are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.
| ft | in | ft | in |
|---|---|---|---|
| 0.25 | 3 | 5.25 | 63 |
| 0.5 | 6 | 5.5 | 66 |
| 0.75 | 9 | 5.75 | 69 |
| 1 | 12 | 6 | 72 |
| 1.5 | 18 | 6.5 | 78 |
| 2 | 24 | 7 | 84 |
| 2.5 | 30 | 8 | 96 |
| 3 | 36 | 9 | 108 |
| 3.5 | 42 | 10 | 120 |
| 4 | 48 | 12 | 144 |
| 4.5 | 54 | 15 | 180 |
| 5 | 60 | 20 | 240 |
Feet to Inches FAQ
How many inches is 4 ft?
4 feet is 48 inches: 4 ft × 12 = 48 in.
How do I convert feet to inches?
Multiply the value in feet by 12. For example, 7 ft × 12 = 84 in. To convert back, divide the value in inches by 12 — or use the Inches to Feet converter.
How many feet are in one inch?
One inch is 0.08333 feet, because 1 in ÷ 12 = 0.08333 ft.
What is 7 feet in inches?
Why are there 12 inches in a foot?
The foot was traditionally split into 12 inches — the word inch comes from the Latin uncia, one twelfth — because 12 divides evenly into halves, thirds, quarters and sixths. The 1959 definitions kept that ratio: 12 in = 1 ft exactly.