Concrete Calculator & Mix

Concrete Calculator helps builders, contractors and DIY users estimate how much concrete, cement and material a project needs — in seconds, fully offline, with no sign-up. Enter your dimensions and the concrete calculator works out the volume, the number of ready-mix bags, a waste-adjusted quantity to order, and an optional cost estimate. Switch freely between metric and imperial units (m³, yd³, ft³). CONCRETE CALCULATORS • Rectangular slab • Circular slab • Footing / foundation • Poured wall • Round column / post • Post holes • Stairs • Concrete bags • Concrete mix (cement : sand : aggregate) • Gravel / sub-base • Basic rebar estimate • Area • Volume CONCRETE MIX DESIGN Get a region-aware mix ratio of cement, sand, aggregate (gravel) and water for your concrete grade: • India M-grades (M20, M25…) • Europe EN 206 C-classes (C16/20…) • CIS / GOST B-classes (B15…) • US strength in psi (3000 psi…) • Australia / NZ N-grades (N20…) WHAT YOU GET • Concrete volume in m³, yd³ and ft³ • Bags needed for common 20/25/30/40/50 kg and 40/60/80 lb sizes • Waste-adjusted volume so you order the right amount • Cement, sand and aggregate quantities by weight and volume • Optional cost estimate in your currency • Shareable estimate text and PDF export BEGINNER AND PRO MODES Beginner mode keeps things simple: dimensions, waste and bag size. Pro mode adds concrete density, custom bag yield and cost per unit for precise planning. WORKS YOUR WAY • Metric or imperial units, changeable anytime • Light and dark themes • Available in multiple languages • Save projects and reopen them later • Optional haptic feedback PRIVACY-FRIENDLY All calculations happen on your device. The app works fully offline — no account and no internet needed. Whether you are pouring a slab, setting fence posts, laying a foundation or mixing concrete by hand, Concrete Calculator gives fast, reliable material estimates. For estimation only. Always verify requirements with local rules, suppliers, or qualified professionals.

First release! Calculate concrete volume, bags & cost for slabs, footings, columns, tubes and more. Free, offline, easy to use.