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Feet and Inches Calculator

Add, subtract, multiply and divide lengths in feet and inches, with the result to the nearest 1/16 inch, in decimal feet, cm and meters. Free.

Result
9 ft 3.25 in
Tape measure (nearest 1/16)
9′ 3 1/4″
Total inches
111.25
Decimal feet
9.2708
Centimeters
282.58
Meters
2.8257

Math with feet and inches

Adding feet and inches by hand means carrying every 12 inches into a foot. This calculator does it for you: 5 ft 8½ in + 3 ft 6¾ in = 9 ft 3¼ in. You can also subtract, or multiply and divide by a number, to split a board into equal pieces or total up several cuts: 5 ft 8½ in ÷ 3 = 1 ft 10 13/16 in to the nearest sixteenth. Results are also shown in total inches, decimal feet, centimeters and meters.

How to use it

  1. 1

    Enter the first length

    In feet and inches (decimals allowed).

  2. 2

    Choose the operation

    Add, subtract, multiply or divide.

  3. 3

    Enter the second length or number

    Read the result in feet, inches and fractions.

Frequently asked questions

How do I add feet and inches?

Add the feet and the inches separately; for every 12 inches, add 1 foot.

How do I convert inches to feet?

Divide by 12. 100 inches = 8 ft 4 in.

Why show 1/16 inch?

Tape measures are usually marked in sixteenths, so that's the precision you can measure and cut.

Is anything stored?

No. The calculation runs in your browser.

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