Feet and Inches Calculator
Add and subtract tape measurements exactly, and read the answer off the tape.
Measurements
Start
= 150" (12' 6")
= 43 5/8" (3' 7 5/8")
= 1/2"
Results update as you typeLive
Feet and Inches · Result
CalculatedTOTAL LENGTH
193 1/8" total
- Inches
- 193 1/8"
- Decimal feet
- 16.0938'
- Millimetres
- 4 905.4 mm
- On the grid
- Yes
Code references & assumptions · 0
How this result is supported
Code references and product data are quoted in the units their source uses.
Reference checks are informational, not compliance determinations.
How feet and inches is calculated
Every term is parsed as an exact fraction and kept that way. Nothing becomes a decimal until it is displayed, so a chain of sixteenths does not accumulate the small errors that decimal conversion introduces.
The answer is shown on a tape grid — sixteenths by default — alongside the exact value. When the exact result does not sit on that grid, the calculator says so rather than rounding silently, because a measurement that reads 7″ on the tape but is not quite 7″ is worth knowing about before you cut.
A scale factor multiplies or divides the total once, after the sum. It carries no unit: a bare number or a typed fraction like 2 1/2, never 2″, because a length is not a scale.
total = t₁ ± t₂ ± t₃ …
Terms added or subtracted in order.
scaled = total × factor or total ÷ factor
Applied once, after the sum.