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Concrete Calculator

Free

Concrete · Volume, ready-mix and bags · default waste 5%

Enter your measurements

Numbers start at typical defaults — change anything. Every result states the inputs and assumptions used.

Applied once to each material quantity, then rounded up to the orderable increment.

Product assumptions — editable3

Sheet sizes, coverage rates, bundle counts, bag yield and similar come from the product you are buying. Change any of them to match your supplier — whatever you set is shown again with the result.

0.6 ft³ for an 80 lb bag of concrete mix, 0.45 ft³ for 60 lb. Check the bag.

Suppliers usually sell in 0.25 or 0.5 cubic yard increments. Ready-mix rounds up to this.

Above this many bags, mixing by hand is usually slower and more expensive than ready-mix.

Enter your measurements and press "Calculate materials" to see the calculated quantity, waste-adjusted quantity and recommended order quantity.

What this calculator does

  • •Volume (ft³) = length × width × (depth ÷ 12) × identical pours
  • •Cubic yards = ft³ ÷ 27; cubic metres = ft³ × 0.0283168
  • •Ready-mix order = cubic yards + waste, rounded up to the supplier's increment
  • •Bags = ft³ + waste ÷ bag yield
Deterministic by design: no AI, no lookups, no network calls — the same inputs always give the same numbers. Product values such as coverage rates and bundle counts are editable and shown with the result.