Sand & Aggregate Calculator
Calculate sand and aggregate quantities for any custom concrete mix ratio.
Assumptions used in this calculation
- Dry volume factor: Uses the standard 1.54 multiplier to account for voids between aggregate particles.
About this calculator
The concrete quantity calculator handles the common M20 mix ratio, but structural drawings or site engineers sometimes specify a custom cement:sand:aggregate ratio, and splitting a wet concrete volume into precise sand and aggregate quantities for a non-standard ratio means both a dry-volume conversion and a proportional split most people skip when estimating by hand. This calculator takes your wet concrete volume, applies the standard 1.54× dry-volume factor to account for the compaction that happens as loose dry materials bind together with water, then divides the resulting dry volume between sand and aggregate according to their share of your custom ratio's total parts. Enter wet volume plus your cement, sand and aggregate ratio parts, and get exact sand and aggregate quantities in cubic feet, ready to order, instead of working through the conversion and ratio math by hand for a mix that doesn't match a standard preset. Because the same dry-volume factor and ratio-split logic apply to any custom mix, this covers ratios well beyond the common 1:1.5:3 M20 default.
Worked example
100 cft wet volume, 1:1.5:3 mix
Result: Sand ≈ 46.2 cft, Aggregate ≈ 92.4 cft
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