HammerCalc is the carpenter calculator and carpentry calculator built for measuring the way the trade works — feet, inches, fractions, stairs, square footage, rafters and more on iPhone, iPad and Mac.
Carpenters don’t need another generic unit converter. They need a carpenter measurement calculator that speaks tape-measure fractions, layouts, and cut math in one place.
Searches for carpenter calculator free or carpenter calculator online free usually want dimensional construction math. HammerCalc’s 7-day trial unlocks the full carpentry toolkit — then one Apple subscription keeps it on every device.
A classic framing square calculator move is rise/run on the square. For a common rafter feel: length ≈ √(run² + rise²) with pitch as rise over 12. HammerCalc’s roof and rafter tools turn that into live diagrams instead of only table lookups.
6/12 pitch on a 12 ft run → rise 6 ft → length ≈ 13 ft 5 in
Two board lengths off a cut list:
A construction calculator aimed at carpentry: feet, inches, fractions, stairs, square footage, rafters and related layout math.
Every plan starts with a 7-day free trial. After that it’s a subscription that covers iPhone, iPad and Mac.
For many common pitch/run length checks, yes — especially with the roof and rafter tools. A physical square is still handy on the sawhorse.
It’s the carpentry-focused way into HammerCalc’s full construction calculator suite.
Carpentry math, stairs, rafters, square footage — all in HammerCalc.
