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Concrete Calculator

Calculate the exact volume, material requirements (cement, sand, aggregate), and cost for your concrete slab or footing.

Feet
Meters

Dimensions

Material Prices (₹)

Concrete Expert Tips

1
Curing is Crucial

Concrete reaches 50% of its strength in the first 3 days, but takes 28 days to fully cure. Keep it moist to prevent cracking!

2
The 1.54 Multiplier

Wet concrete shrinks! Always multiply your required wet volume by 1.54 to find the correct dry materials needed.

3
Avoid Too Much Water

Adding extra water makes concrete easier to pour, but significantly weakens the final structure. Stick to the precise water-cement ratio.

Enter your dimensions on the left and click Calculate Cost to see the exact bags of cement needed.

The Science of Concrete Mixing

Getting your concrete mix right is critical for the structural integrity of your building. This calculator uses standard industry ratios to ensure you buy exactly what you need without massive wastage.

Common Concrete Grades

  • M15 (1:2:4): Used for non-structural work, light foundations, and PCC (Plain Cement Concrete).
  • M20 (1:1.5:3): The standard grade for residential slabs, beams, and columns. (This calculator assumes M20 ratio by default).
  • M25 (1:1:2): High-strength concrete for heavy-duty commercial foundations.

Why do we multiply by 1.54? (Dry vs Wet Volume)

When water is added to dry materials (cement, sand, aggregate), the mixture shrinks because the fine particles fill the voids between the coarse particles. To get 1 cubic meter of wet concrete, you need approximately 1.54 cubic meters of dry materials. Our pro-level calculator handles this conversion automatically!