Crushed rock Volume Calculator
Estimate the volume and weight of crushed rock needed to cover an area to a chosen depth. Enter length, width and depth, then add an allowance for…
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Estimate the volume and weight of crushed rock needed to cover an area to a chosen depth. Enter length, width and depth, then add an allowance for waste. Uses a typical density of 1.7 tonnes per cubic metre.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (length = 6 m, width = 3 m, depth = 100 mm, waste allowance = %5), the results are: volume needed 1.89 m³; approximate weight 3.21 tonnes.
Quick reference: length vs result
Reference table based on the example values; it is not your calculation result.
| Length (m) | Volume needed | Approximate weight |
|---|---|---|
| 3 | 0.95 m³ | 1.61 tonnes |
| 6 | 1.89 m³ | 3.21 tonnes |
| 12 | 3.78 m³ | 6.43 tonnes |
| 30 | 9.45 m³ | 16.07 tonnes |
| 60 | 18.90 m³ | 32.13 tonnes |
| 120 | 37.80 m³ | 64.26 tonnes |
Frequently asked questions
What formula does this calculator use?
Volume needed = length × width × depth ÷ 1000 × (1+waste ÷ 100); Approximate weight = vol × dens. Variables: length = length in m, width = width in m, depth = depth in mm, waste = waste allowance in %. Fixed values: dens = 1.7.
What do I need to enter?
You need length (m), width (m), depth (mm), waste allowance (%). Results update as you type.
What is an example result?
With the default inputs (length = 6 m, width = 3 m, depth = 100 mm, waste allowance = %5), the results are: volume needed 1.89 m³; approximate weight 3.21 tonnes.
What density does this use?
It assumes crushed rock weighs about 1.7 tonnes per cubic metre. Moisture and grade change this, so confirm with your supplier before ordering.
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