Concrete Calculator

Concrete volume for slabs, footings, columns and steps — bags or ready-mix.

Runs in your browser — nothing is uploaded
Units

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Material estimates only — add waste, confirm quantities with your supplier and follow local building codes. Not an engineering guarantee.

How to use Concrete Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

Slab: length × width × thickness

Column: π × (diameter ÷ 2)² × height

Bags = volume × 2,350 kg/m³ ÷ bag weight