Feet and Inches Calculator

Add, subtract, multiply and divide lengths in feet and inches with fractions, and convert to metric.

First length	5' 7 3/8"
Operation	+
Second length	2' 9 1/4"
Round to	1/16″

First length

Operation

Second length

Round to

Result

8′ 4 5/8″

= 100.625 in = 8.3854 ft = 255.59 cm (2.5559 m).

About the Feet and Inches Calculator

Type lengths as you'd read them off a tape, such as 5' 7 3/8", choose an operation, and pick the fraction to round to. The calculator gives the answer in feet, inches and fractions, plus decimal inches, decimal feet, centimetres and metres. You can also type metric lengths like 170 cm.

Builders' tape measures read in feet, inches and fractions down to 1/16 or 1/32 of an inch. This calculator does the arithmetic exactly and rounds only the final answer.

The formula

1 ft = 12 in; 1 in = 2.54 cm exactly

Worked example

5' 7 3/8" + 2' 9 1/4"

Inches: 67.375 + 33.25 = 100.625 in
= 8' 4 5/8"
= 255.59 cm

Questions people ask

How do I type 5 feet 7 and 3/8 inches?

5' 7 3/8" or 5ft 7 3/8in.

What's 3/8 inch in mm?

9.525 mm.

How do I split a board into equal pieces?

Choose ÷ and enter the number of pieces; remember to allow for the saw cut (kerf) between pieces.