A foot is defined as exactly 12 inches — a simple, fixed conversion within the US customary length system.
How it works
Multiplying feet by 12 gives inches; dividing inches by 12 gives feet back. Type into either field and the other updates instantly.
What this does not include
This does not include the metric system — for converting to centimeters, use this site’s cm-to-in or in-to-cm calculators instead.
How to use this calculator
- Enter a value in either feet or inches — the other field fills in automatically.
Frequently asked questions
Where is this conversion most commonly needed?
Construction, carpentry, and reading measurements from a blueprint or tape measure marked in one unit but needed in the other.
Why is a foot exactly 12 inches?
It’s a long-standing definitional relationship within the US customary and imperial measurement systems, unchanged for centuries.
Can this handle fractional feet, like 5.5 feet?
Yes — entering 5.5 feet converts to exactly 66 inches, and any fractional value works the same way in both directions.
