Construction Calculators

Free construction calculators. No signup. No BS.

Fast, mobile-first, accurate estimates — materials, cost, and leftover — free forever. Built for DIY homeowners and small contractors in the US, UK, AU, and CA.

Composite Decking Calculator

Estimate boards, fasteners, and total cost for your deck based on size and install pattern.

Retaining Wall Block Calculator

Estimate blocks, base gravel, backfill, and cost for a concrete or stone retaining wall.

Paint + Primer Coverage Calculator

Estimate paint and primer needed for a room, plus how much leftover you'll have for touch-ups.