Concrete Mix Design Calculator

Site Engineer's Guide for M20, M25 & M30 Proportions

Mix Specifications

CONCRETE GRADE TOTAL VOLUME (Cubic Metre - m³) WASTAGE (%)

CEMENT 0 Bags

SAND (Fine Agg.) 0.00 m³

AGGREGATE (Coarse) 0.00 m³

WATER (Approx) 0 Litres

Concrete Mix Proportions (IS 456:2000)

Concrete Mix Design is the process of finding the right proportions of cement, sand, and aggregates to achieve the target strength. According to IS 456:2000, "Nominal Mix Concrete" is used for grades up to M20.

1. Dry Volume Factor

Concrete shrinks when water is added. We take 1.54 as the dry volume factor (54% extra) to account for the voids in sand and aggregate.

2. Water-Cement Ratio

For M20, the standard W/C ratio is 0.50. This means for every 50kg bag of cement, 25 litres of water is required.

Site Engineer Note: The results provided are for nominal mixes. For high-strength concrete (M30 and above), a Design Mix as per IS 10262 must be performed in a laboratory.