Garden & Landscaping calculator
Crushed Stone Calculator
Estimate crushed-stone volume and tonnage from length, width, layer depth, bulk density and an extra allowance.
Estimate crushed-stone volume and tonnage from length, width, layer depth, bulk density and an extra allowance. For a reliable estimate, measure the real project rather than relying on nominal room or product sizes. The input most worth checking is depth and bulk density. Crushed stone used as a base is commonly compacted. Calculate the required compacted layer, then use the supplier's conversion or compaction factor when ordering loose material.
What you need to enter
The Crushed Stone Calculator uses the following project information to calculate the result.
- Length
- Width
- Depth
- Material density
- Extra allowance (%)
Calculator result
Volume and estimated weight
How the Crushed Stone Calculator works
To produce volume and estimated weight, the Crushed Stone Calculator applies volume = L×W×D; mass = volume×density. The engine is configured for crushed stone for sub-bases, driveways and drainage layers, not as a generic text estimate. Check depth and bulk density, since an incorrect value there can materially change the result.
Crushed Stone Calculator worked example
Crushed Stone Calculator example: A 12 m × 3 m base layer at 100 mm depth needs 3.60 m³ of compacted stone. At an illustrative density of 1.8 t/m³ that is 6.48 tonnes; adding 10% gives about 7.13 tonnes before supplier-specific compaction factors. The worked figure becomes more useful when depth and bulk density is taken from the real product or site rather than a generic default.
Important calculation assumptions
For crushed stone for sub-bases, driveways and drainage layers, crushed stone used as a base is commonly compacted. Calculate the required compacted layer, then use the supplier's conversion or compaction factor when ordering loose material.
Frequently asked questions
How should I collect the measurements for the Crushed Stone Calculator?
For crushed stone for sub-bases, driveways and drainage layers, measure length, width and finished layer depth. Use a density that matches the material in the condition it will be supplied or compacted. This keeps the calculation tied to the actual job rather than a generic assumption.
Should I use a default value for depth and bulk density in the Crushed Stone Calculator?
Do not chase extra decimal precision in the Crushed Stone Calculator until you have realistic values for depth and bulk density. Crushed stone used as a base is commonly compacted. Calculate the required compacted layer, then use the supplier's conversion or compaction factor when ordering loose material.
How should I turn the Crushed Stone Calculator result into an order quantity?
For the Crushed Stone Calculator, use the result in context: use the required compacted layer as the target, then apply the supplier's loose-to-compacted conversion or tonnage guidance before ordering.