The carpentry-style “how long is this board plus that board” question, answered directly in feet and inches.
How it works
Both measurements are converted to total inches, added or subtracted, then converted back into a normalized feet-and-inches result.
What this does not include
This does not include a plain feet-to-inches conversion — for that, use this site’s feet-to-inches calculator instead. This tool specifically adds or subtracts two such measurements.
How to use this calculator
- Choose add or subtract, then enter both measurements in feet and inches.
Frequently asked questions
What happens if I subtract a larger measurement from a smaller one?
The calculator declines to show a result, since a negative length doesn’t have a meaningful answer here.
Why convert to total inches first instead of adding feet and inches separately?
Adding the parts separately can produce an invalid result like “7 feet 14 inches” — converting to total inches first and splitting the sum back out avoids that carrying error.
What’s a practical use for this?
Carpentry and construction measurements, where board lengths or wall segments are commonly given in feet and inches and need combining.
