Free construction calculators
Quick answers for site and office. No sign-up needed.
Price escalation calculator
Contract price adjustment by index formula (FIDIC 13.8, Haylett style).
Retention calculator
Retention held, the cap, and what is released at completion and after defects.
Payment certificate calculator
Work done, variations, materials on site, less retention and previous certificates.
Concrete calculator
Volume for slabs, footings and columns, with cement, sand and stone by mix.
Brick and block calculator
Bricks or blocks and mortar for a wall, with openings and waste.
Rebar weight calculator
Weight of reinforcing bar by diameter and length.
Cost per square metre
A feasibility range to build by country, building type and specification.