Free construction calculators
Stairs, roofs, concrete, lumber and wiring, worked out with diagrams, 3D views and code checks. Built to work on a phone at the job site, with results you can share or print.
Stair Calculator
Risers, treads and a stringer layout, checked against residential code.
Open toolRoof Pitch Calculator
Pitch, angle, rafter length and roofing squares for gable, hip and shed roofs.
Open toolBoard Foot Calculator
Board feet and lumber cost for a whole list of boards.
Open toolConcrete Calculator
Cubic yards and bags for slabs, footings and round columns.
Open toolSquare Footage Calculator
Add up rooms and shapes in feet and inches, with cost per square foot.
Open toolGravel Calculator
Cubic yards, tons and bags of gravel, sand or soil for any area.
Open toolMulch Calculator
Cubic yards and bags of mulch for beds of any size and depth.
Open toolVoltage Drop Calculator
Voltage drop for copper and aluminum wire, and the smallest size under 3%.
Open toolPlan a whole project
Common jobs and the tools to use, in order.
Building a deck
Footings, framing lumber, then the stairs down to the yard.
Re-roofing or building a shed
Roof pitch and shingles, a slab to build on, and wire for power.
Landscaping the yard
Measure the areas, then order stone for paths and mulch for beds.