PreConstruct AIFree tools
Free construction calculators for estimators
Free estimating calculators for contractors: concrete, block and ICF; drywall, metal studs, insulation and paint; stair stringers; and rebar weights from 10M to 55M.
Concrete calculator
Slabs, footings, walls, pads, columns and stair flights — cubic yards, cubic metres and the half-yard order.
Open the calculator →
Drywall calculator
Sheets by size, screws, tape and joint compound for walls and ceilings, less openings, at your own rates.
Open the calculator →
Stair stringer calculator
Riser height, total run and stringer length from the total rise, risers and tread — checked against Ontario's riser limits.
Open the calculator →
Rebar weight calculator
CSA 10M to 55M and ASTM #3 to #11: bars by length or a slab mat each way, in kilograms, pounds and tonnes.
Open the calculator →
Metal stud calculator
Steel studs at your spacing, extras at openings and corners, and top and bottom track in 10 ft pieces.
Open the calculator →
Wood framing calculator
Studs, plates in stock lengths and sheathing sheets for a wood wall; stud and header sizes come from the drawings.
Open the calculator →
Insulation calculator
Bags of R14, R22 or R24 batts for walls and ceilings, less openings, at the coverage on the bag.
Open the calculator →
Paint calculator
Finish and primer for walls and ceilings in 3.78 L cans or 18.9 L pails, from the coats and the data sheet.
Open the calculator →
Concrete block calculator
8 × 16 or 20 cm metric block, mortar bags and core grout in cubic yards and cubic metres.
Open the calculator →
ICF calculator
Insulated concrete forms, straight and corner, and the concrete for the core, rounded to the half yard.
Open the calculator →
Every calculator here, on the drawings themselves
Measure on the PDF, type the sizes the drawings print, and every material comes out with its working — in imperial, metric or both. Your first bid is free.