Feet and Inches Calculator
Enter two lengths in feet and inches. 5 ft 8 in plus 3 ft 6 in is 9 ft 2 in, which equals 110 in.
How the feet and inches calculator works
Lengths in feet and inches are awkward to add by hand because 12 inches make a foot. The calculator converts each length to inches, does the math and converts back to feet and inches. It also shows decimal feet, which is handy for spreadsheets and plans, and meters.
The formulas
Example: 5 ft 8 in is 68 inches and 3 ft 6 in is 42 inches. Together they are 110 inches, which is 9 ft 2 in or 9.167 ft in decimal feet and 2.794 m.
Notes and limits
- Fractions of an inch can be entered as decimals, for example 8.5 for 8 and a half.
- For area or volume of a space use a separate calculator.
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Frequently asked questions
How do I add feet and inches?
Convert both lengths to inches, add them, then divide by 12 for feet and keep the remainder as inches.
How do I convert inches to decimal feet?
Divide inches by 12. 6 inches is 0.5 feet.
How many inches are in a foot?
12.
How do I enter a fraction like 3/8?
Use 0.375 in the inches box.
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