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Aggregate Quantity Calculator

Coarse aggregate for a concrete mix, by volume and by weight. Aggregate does not bulk the way sand does, so the ordered quantity is the mix quantity.

Also called: coarse aggregate calculator, stone quantity.

Aggregate (m³)
2.52

2.52 m³ of aggregate, about 3.78 tonnes at 1,500 kg/m³. That is 0.9 tractor loads or 89 cubic feet.

Approximate tonnes
3.78
In cubic feet
89
Tractor loads at 2.8 m³
0.9
Dry volume (m³)
4.62
Aggregate share of the mix
0.55
How this is calculated
Method and background

How this is calculated

The same dry-volume split as cement and sand, taking the aggregate share. Unlike sand, coarse aggregate has no meaningful bulking effect: the particles are too large for surface moisture to hold them apart, so what the mix needs is what you order. Bulk density varies with the nominal size and grading, which is why it is an input rather than a constant.

aggregate = wet volume * dry factor * aggregate share of the mix
c
Aggregate parts (parts)
total parts
Sum of the mix parts (parts)

Worked examples

Each of these is asserted on every build. If a change to the engine ever moved one of these answers, the build would fail before the page could print it.

M20 aggregate for one cubic metre

Concrete volume (m³)
1
Aggregate parts in the mix
3
Total parts in the mix
5.5
Dry volume factor
1.54
Bulk density (kg/m³)
1,500

Aggregate (m³)0.84

1.54 * 3 / 5.5, at 1500 kg/m³

Open this example

a richer mix needs less aggregate

Concrete volume (m³)
1
Aggregate parts in the mix
2
Total parts in the mix
4
Dry volume factor
1.54
Bulk density (kg/m³)
1,500

Aggregate (m³)0.77

boundary

Open this example

Method and limits

What it assumes

  • A nominal mix by volume.

What it deliberately does not model

  • Bulk density varies from about 1350 to 1600 kg/m³ with size and grading.
  • Flaky or elongated aggregate packs differently and changes the workable mix.

Sources

Formula version 1.0.0 · definition 1.0.0 · India · Report a problem with this calculator

Frequently asked questions

Why does aggregate not need a bulking allowance when sand does?
Because the particles are far larger. Moisture films only push grains apart when the grains are small enough for surface tension to matter, which is why the effect is a sand problem.