Feet to Inches
Convert feet (ft) to inches (in). Both measure distance and dimension, and the conversion comes up in construction, navigation, sports work.
The Formula
``
inches = feet × 12
feet = inches × 0.0833333333333
`
One foot is 12 inches, and one inch is 0.083333 feet.
Conversion Table
| 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 | 1,200 in |
| 500 ft | 6,000 in |
| 1,000 ft | 12,000 in |
The Other Direction
| Inches | Feet |
|---|---|
| 1 in | 0.083333 ft |
| 2 in | 0.166667 ft |
| 5 in | 0.416667 ft |
| 10 in | 0.833333 ft |
| 25 in | 2.0833 ft |
| 50 in | 4.1667 ft |
| 100 in | 8.3333 ft |
| 500 in | 41.6667 ft |
| 1,000 in | 83.3333 ft |
What Each Unit Is
Feet (ft) — exactly 0.3048 metres, or one third of a yard. A human foot, standardised across centuries of conflicting local definitions.
Inches (in) — exactly 2.54 centimetres — an exact figure, not a rounded one. From the Latin uncia, one twelfth (of a foot); the exact metric value was agreed in 1959.
A Sense of Scale
A ceiling is 8–9 ft- Aviation altitude is always in feet
- A door is about 6.7 ft
- A thumb is about an inch wide
- Screens are measured diagonally in inches
- US rainfall is in inches
Precision
The factor 12 is exact by international agreement, not a rounded approximation. Any imprecision in a result comes from your input, not the conversion.
Watch Out For
- Because the inch is exactly 2.54 cm, inch↔cm conversions are exact and any rounding you see comes from your own input precision, not the factor.
In Code
`javascript
const footToInch = (value) => value * 12;
``
Where This Conversion Comes Up
- Construction
- Navigation
- Sports
- Sewing
- Mapping
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 ft with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 ft becomes | Error |
|---|---|---|---|
| 0 | 12 | 1,644 | — |
| 1 | 12 | 1,644 | — |
| 2 | 12 | 1,644 | — |
| 3 | 12 | 1,644 | — |
| 4 | 12 | 1,644 | — |
The right number of significant figures is set by your input, not by the converter. If you measured feet to three significant figures, the answer in inches is only good to three — writing more digits claims precision the measurement never had.