Convert feet to inches
1 ft = 12 in
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How many inches are in a foot?
One foot is 12 inches. To convert any amount, multiply by 12. Going the other way, one inch is 0.0833333333 feet.
What is the formula to convert ft to in?
Multiply the foot figure by 12. So in = ft × 12. For a quick mental estimate, multiplying by about 12 gets you within a percent or so, which is close enough for most everyday purposes.
What does a foot actually look like?
One foot is about the length of a standard ruler. The foot is exactly 0.3048 metres. It survives in aviation worldwide — altitudes are given in feet almost everywhere, including in fully metric countries.
And what is a inch?
One inch is roughly the width of an adult thumb. The inch has been exactly 25.4 millimetres since 1959. Screen sizes, pipe diameters and tyre rims are still specified in inches almost universally.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding ft before converting introduces an error the conversion then multiplies.
About ft to in
How to convert feet to inches
Multiply by 12. One foot is 12 inches, and one inch is 0.0833333333 feet.
in = ft × 12
Worked example
10 ft = 120 in. For a sense of scale, one foot is about the length of a standard ruler, and one inch is roughly the width of an adult thumb.
About the foot
The foot is exactly 0.3048 metres. It survives in aviation worldwide — altitudes are given in feet almost everywhere, including in fully metric countries.
About the inch
The inch has been exactly 25.4 millimetres since 1959. Screen sizes, pipe diameters and tyre rims are still specified in inches almost universally.
Quick reference
| feet | inches |
|---|---|
| 1 ft | 12 in |
| 2 ft | 24 in |
| 5 ft | 60 in |
| 10 ft | 120 in |
| 25 ft | 300 in |
| 50 ft | 600 in |
| 100 ft | 1200 in |
| 1000 ft | 12000 in |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding ft to a whole number before converting introduces an error that the conversion then multiplies.
Other length conversions
Convert inches back to feet, or pick any other pair with the full unit converter. Related: ft to km, ft to m, ft to cm.