Calculators

Feet and Inches Calculator

Add or subtract lengths in feet and inches. Results in feet and inches to the nearest 1/16", decimal feet, inches and centimetres.

ft
in
ft
in

Enter your values and press Calculate.

How to use the Feet and Inches calculator

Carpenters, framers and DIYers constantly add and subtract imperial measurements. Doing it by hand means carrying inches over 12 — this calculator handles that for you and shows the answer the way you would read it on a tape measure.

Formula

Convert each length to inches (feet × 12 + inches), add or subtract, then convert back: whole feet = total ÷ 12 (rounded down), and the remainder is inches. Inches are rounded to the nearest 1/16″ for tape-measure readability.

Frequently asked questions

How do you add feet and inches?

Add the inches together and the feet together. If the inches total 12 or more, subtract 12 and add one foot.

How do I convert decimal feet to feet and inches?

Keep the whole number as feet and multiply the decimal part by 12 to get inches. 5.75 ft = 5 ft 9 in.

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