Aggregate Calculator
Calculate the volume and weight of coarse aggregate needed for a given volume of concrete and mix ratio.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter your concrete volume and mix ratio to find the aggregate volume and weight needed.
Your result
0.882
Aggregate volume
Aggregate weight1,323
AI explanation
Formula
Dry volume = wet volume × (1 + wastage%) × 1.54; aggregate volume = dry volume × (aggregate parts ÷ total parts)Worked example
1 m³ of M20 concrete, 5% wastage
| Field | Value |
|---|---|
| Wet concrete volume (m³) | 1 |
| Concrete mix | M20 (1:1.5:3) |
| Wastage allowance (%) | 5 |
| Aggregate volume | 0.882 |
| Aggregate weight | 1323 |
Assumptions
- Aggregate density assumed at 1500 kg/m³ (typical loose bulk density for crushed stone aggregate — actual density varies by source and gradation).
- Dry volume = wet volume × 1.54, the standard site-estimation factor.
Frequently asked questions
What counts as "aggregate" in this calculator?
Coarse aggregate — crushed stone or gravel — the largest-particle-size ingredient in concrete, distinct from fine aggregate (sand).
Why does a richer mix need less aggregate proportionally?
A richer mix (like M25) has a smaller aggregate-to-cement ratio than a leaner mix (like M15), so more of the dry volume goes to cement and less to aggregate.
I need cement and sand quantities too — is there one calculator for all three?
Yes — the Concrete Calculator (and the Slab/Footing/Column Calculators) show all three quantities together from the same inputs.