Skip to content
2x2xKit

Concrete Quantity Calculator

Estimate cement, sand and aggregate needed for a concrete slab.

How this is calculated
Dry volume = Wet volume × 1.54; split by the 1:1.5:3 mix ratio

Assumptions used in this calculation

  • Mix ratio: Assumes M20 grade concrete (1:1.5:3) with a 1.54× dry volume factor and 50kg cement bags.

About this calculator

The concrete quantity calculator estimates cement bags, sand and aggregate needed for an M20-mix (1:1.5:3) concrete slab from its dimensions.

Worked example

20 × 15 ft slab, 4-inch thick

Result: ≈ 27 cement bags

Was this helpful?

Frequently asked questions

Related calculators

Popular

Construction Cost Calculator

Estimate construction cost from built-up area and rate per square foot.

Paint Quantity Calculator

Estimate how much paint you need for a wall area.

Tile Quantity Calculator

Estimate how many tiles you need for a room, including wastage.