Construction Calculators

Free construction calculators with real-time diagrams. Native feet-inch-fraction input, offline capable, no subscription.

Feet-inch-fraction arithmetic with conversions. The free CM Pro replacement.

Riser height, stringer length, angle, and profile diagram

Equal spacing with code-compliant max gap

Rafter length, ridge height, birdsmouth, and cutting angles

Roof area, shingle bundles, and sheathing count

Feet-inch-fraction arithmetic, conversions, and mode switcher

Rise, run, diagonal, pitch, and grade

Bending, deflection, and shear checks with NDS values

L/360 and L/720 pass/fail for ceramic and stone tile

Door and window header sizing with IRC span tables

Floor joist max spans per IRC tables

Stud layout with openings, headers, and cripples

Deck joist spans per IRC R507.5

LVL and glulam beam sizing from manufacturer tables

Cubic yards, bag count, and cost for slabs, footings, columns

Crown molding blade tilt and miter angles

Lumber volume estimation and pricing

Sheet goods bin packing with visual cutting diagrams

Sheet count, tape, mud, and screws for rooms

The free Construction Master Pro replacement — with diagrams.