About this calculator
Do tape-measure arithmetic without converting to decimals: add and subtract feet, inches and fractions, or multiply and divide by a number, rounded to the fraction you can mark.
How it’s calculated
Measurements are converted to an exact length, calculated, then shown back as feet, inches and the nearest fraction.
Worked example
With these inputs:
- First measurement
- 12' 6-1/2" ft
- Operation
- Add +
- Second measurement
- 3' 9-3/4" ft
- Round to
- 1/16"
the result is:
- Result
- 16' 4-1/4"
- Inches
- 196-1/4"
- Decimal feet
- 16.3542 ft
- Millimetres
- 4,984.8 mm
- Metres
- 4.9848 m
Tips from the trade
- Dividing a length to find even spacing? The spacing calculator gives the marks too.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and the Building Regulations before ordering.