Which concrete grade should I choose?
M20 is common for slabs and driveways. M10–M15 suit lean mixes and blinding layers. M25–M30 are used for heavier structural elements.
Cement Calculator
Estimate cement, sand, aggregate, and water for concrete pours by volume and grade.
Cement Calculator Formula
- Concrete Volume
Length × Width × Thickness (converted to m³) - Cement Required
Volume × Cement per m³ for selected grade - Cement Bags
Cement (kg) ÷ 50 kg, rounded up - Sand & Aggregate
Volume × grade ratio per m³ - Water
Volume × water requirement per m³
Assumptions
- Material ratios follow standard nominal mix proportions for each concrete grade.
- Cement bags are assumed to be 50 kg.
- Foot measurements are converted to metres before volume calculation.
Frequently Asked Questions
Does this include wastage?
The estimate uses standard mix ratios. Add extra material on site for spillage and uneven sub-base as needed.
Can I use feet for dimensions?
Yes. Select ft as the unit and all dimensions are converted to metres internally before calculating volume.