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.