How to Use the Concrete Mix Calculator
Accurate material takeoff is the first step to a successful concrete pour. This calculator uses standard mix design ratios to estimate cement, sand (fine aggregate), coarse aggregate (gravel), and water per cubic meter, then scales to your required volume.
The mix design values are based on typical proportions for each strength class. Always add a 5–10% buffer for on-site waste. For critical structural work, verify proportions with an engineer and perform trial batches.
Mix Design Reference
- 15 MPa (2,000 psi): leveling concrete, non-structural fill
- 21 MPa (3,000 psi): residential slabs, driveways, sidewalks
- 28 MPa (4,000 psi): footings, foundation walls, structural slabs
- 35 MPa (5,000 psi): high-load columns, bridge decks
Frequently Asked Questions
Multiply length × width × thickness (all in meters). For example, a 4 m × 5 m slab at 150 mm thick = 4 × 5 × 0.15 = 3.0 m³.
Yes — ready-mix trucks deliver pre-batched concrete by the cubic yard or cubic meter. This calculator helps you specify the volume and confirm quantities with your supplier.