Feet and inches calculator
Add a length. Subtract a cut.
Keep every fraction of an inch.
Enter feet, whole inches, and an optional fraction for each measurement. Both units are set to feet and inches to get you started.
Start calculatingTry a measurement
5 ft 10 3/4 in + 2 ft 4 1/2 in
= 8 ft 3 1/4 in
Builder’s calculator
Editing first whole inches
Tap any field to edit · Backspace moves back when empty
Settings
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If your preferred languages aren’t supported, Inch Plus uses English.
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Check your measurements and results before cutting or installing. Calculations run in your browser.
One entry for each length.
- Enter feet and whole inches in their own fields. For 5 ft 10 3/4 in, enter 5 feet, 10 inches, 3 above the fraction line, and 4 below it.
- Choose add or subtract, then enter the second measurement. Leave fraction fields blank for a whole-inch measurement.
- Read the live answer. Choose ft–in, inches, decimal feet, or metric below the result. Calculate saves a valid calculation to local history.
How the example works
Convert both lengths to inches: 5 ft 10 3/4 in is 70 3/4 in, and 2 ft 4 1/2 in is 28 1/2 in. Together they make 99 1/4 in. Since 96 inches is 8 feet, the result is 8 ft 3 1/4 in.
To subtract, choose the minus sign. For example, 8 ft − 2 ft 6 in = 5 ft 6 in.
Feet and inches, or decimal feet?
5.5 decimal feet means 5 ft 6 in, not 5 ft 5 in. Select Decimal feet when your measurement uses a decimal point. Each measurement can have a different unit; Inch Plus converts them before adding or subtracting.
Take the answer to your tape.
Keep the exact answer, or select the nearest 1/8, 1/16, 1/32, or 1/64 inch under Tape rounding. The rounded value is shown separately so you can see what changed.
For repeated sections, use the equal-parts calculator. For inch-only work, use the fraction calculator.