The feet-to-inches conversion comes up in DIY, tailoring, and school maths more than almost any other. The foot and the inch both belong to the imperial and US customary systems, and they share the simplest possible relationship: one foot contains exactly twelve inches. Heights are the classic example — a person described as 5 feet 9 inches is 69 inches tall — but the same conversion appears in carpentry, screen sizes, plumbing, and anywhere else imperial units remain the norm.
Because the factor is the whole number 12, converting feet to inches never produces messy decimals: you simply multiply by 12. The reverse is just as clean — divide inches by 12 to get feet, leaving any remainder as inches (70 inches ÷ 12 = 5 feet 9 inches). The inch itself is defined metrically as exactly 25.4 millimeters, which keeps the whole imperial system precisely anchored to the metric one.
Quick reference for common values: a standard sheet of plywood measures 4 feet by 8 feet (48 by 96 inches), a king-size mattress is 76 inches wide, and most interior doors stand 80 inches tall. Because the factor is 12, you can convert any of these in your head — but the calculator above is faster and eliminates arithmetic slips.
Feet to Inches Converter
Result will appear here
Feet to Inches Conversion Formula
The conversion formula is: in = ft × 12
Worked example: 2.5 ft × 12 = 30 in — so two and a half feet is exactly thirty inches.
To convert back, divide instead of multiplying: ft = in ÷ 12.
How to Convert Feet to Inches
- Enter your value in feet in the converter above.
- The result in inches appears instantly as you type.
- Use the Swap button to convert inches back to feet.
- For manual calculations, multiply the feet value by 12.
Feet to Inches Conversion Chart
| Feet (ft) | Inches (in) |
| 1 | 12 |
| 2 | 24 |
| 3 | 36 |
| 4 | 48 |
| 5 | 60 |
| 6 | 72 |
| 7 | 84 |
| 8 | 96 |
| 9 | 108 |
| 10 | 120 |
| 25 | 300 |
| 50 | 600 |
| 100 | 1200 |
FAQs
What is the formula to convert feet to inches?
Multiply feet by 12: inches = feet × 12. A 7-foot door, for example, is 7 × 12 = 84 inches tall. It is one of the few conversions with a whole-number factor, so the answer is always exact.
How many inches are in 5 feet?
Five feet equals 60 inches (5 × 12). Because the factor is a whole number, feet-to-inches answers never involve fractions or rounding — every result is precise.
How do I convert inches back to feet?
Divide the inches by 12. If there is a remainder, it stays as inches: 65 inches ÷ 12 = 5 feet 5 inches. The Swap button on the converter above performs the reverse calculation automatically.
Which is bigger, a foot or an inch?
A foot is twelve times bigger than an inch. Twelve inches laid end to end make exactly one foot — that is where the unit's name comes from, originally based on the length of a human foot.
Where is the feet-to-inches conversion used in real life?
Human heights are the most familiar case, but carpenters measure timber in feet and inches, television and laptop screens are sized in inches while room layouts use feet, and plumbers size pipes in inches for buildings whose plans are drawn in feet.