Feet to Inches Calculator
Convert feet to inches instantly.
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Enter your values and click Calculate
How It Works
Inches = Feet × 12. The relationship is exact and defined: one foot is officially defined as 12 inches by the US National Institute of Standards and Technology. Decimal foot inputs are handled by simple multiplication — 5.75 feet × 12 = 69 inches exactly (5 feet 9 inches). The result is displayed to four decimal places to accommodate irrational or repeating decimal inputs like 1/3 foot = 4.0000 inches (which is exact) vs. 1/7 foot ≈ 1.7143 inches.
Examples
6 feet
Typical adult male height.
Result: 72 inches.
5.5 feet
5 feet 6 inches expressed as decimal feet.
Result: 66 inches.
100 feet
A large room or field length.
Result: 1,200 inches.
Frequently Asked Questions
How many inches are in a foot?
There are exactly 12 inches in one foot, by definition. This has been the standard since the international yard and pound agreement of 1959.
How do I convert 5 feet 10 inches to just inches?
Multiply 5 by 12 to get 60, then add the remaining 10 inches, for a total of 70 inches. Alternatively, convert 5 feet 10 inches to decimal feet first: 5 + 10/12 ≈ 5.833 feet, then multiply by 12.
Can I enter a decimal number of feet?
Yes. Enter any decimal value such as 4.25 for 4 feet 3 inches (since 0.25 × 12 = 3). The calculator multiplies directly and returns the total inches.