How many inches are in a foot?
There are exactly 12 inches in one foot.
Feet and Inches Calculator
Convert a feet-and-inches measurement to total inches and metric units, or reverse it.
Convert feet and inches
Choose a direction, then use feet and inches or the total-inches field.
About this converter
How to use Feet and Inches Calculator, plus the formulas and logic behind the results.
Tool description
This calculator combines customary feet and inches or decomposes a total-inch measurement, while also reporting centimeters and meters.
How to use
- Choose the conversion direction.
- Enter feet and inches, or enter total inches for reverse mode.
- Select Calculate.
- Review customary and metric results.
Formulas & reference
total inches = feet × 12 + inchescentimeters = total inches × 2.54feet part = floor(total inches ÷ 12)
Calculation logic
Forward mode totals the inches. Reverse mode uses whole 12-inch groups as feet and keeps the remainder as inches.
Feet and Inches Calculator FAQ
Common questions about this conversion and how to interpret the result.
Can inches exceed 11 in forward mode?
Yes. They are included in the total and may represent additional feet.
How are centimeters calculated?
Total inches are multiplied by exactly 2.54.
Can I use decimal inches?
Yes. Fractional decimal inches are preserved in the result.
How does reverse mode work?
It divides total inches into whole feet and the remaining inches.
Does the calculator accept negative lengths?
No. Physical length inputs must be zero or greater.