Feet and inches calculator adds or subtracts two imperial measurements without manual carrying.
About this calculator
Feet and inches calculator adds or subtracts two imperial measurements without manual carrying. Enter feet and inches for each length, pick add or subtract, and get the result in feet-inches, total inches, and decimal feet.
Carpenters, tailors, and DIY builders in India still work in feet-inches for interior fit-outs and fabric cuts even though metric is official. Adding 5 ft 8 in to 2 ft 4 in manually risks inch-overflow mistakes — this tool converts to total inches first, then back.
Convert results to metric with [[length]] converter. For area calculations see [[paint]] and [[tile]]. Construction volume uses [[cubic-yards]] when depth is involved.
Common uses
- Carpenter adding two wall section lengths for trim order
- Tailor subtracting seam allowance from fabric measurement
- DIY shelf project combining two board lengths
- Interior designer totaling room dimensions in ft-in
- Student learning imperial unit conversion in math class
Frequently asked questions
How do you add 5 feet 8 inches and 2 feet 4 inches?
Convert to inches: 68 + 28 = 96 inches = 8 feet 0 inches. Enter feetA=5, inchesA=8, feetB=2, inchesB=4, operation add.
Can I enter fractional inches like 3 and a half?
Yes. Enter 3.5 in the inches field for 3½ inches. The calculator supports decimal fractions commonly used in construction (eighths: 0.125, 0.25, 0.375, etc.).
What happens if subtraction gives a negative result?
The result shows negative feet/inches indicating the second length exceeds the first. Use absolute context — e.g. how much shorter piece B is than piece A.
How do I convert the result to centimetres?
Multiply decimal feet by 30.48, or total inches by 2.54. This calculator shows decimal feet for easy metric conversion. Use the [[length]] converter for exact cm.