Aggregates calculator
Calculate how much aggregate you need.
Estimate tonnes of MOT Type 1, sand, gravel, sub-base and other aggregates using length, width and depth.
Best for
- Driveway sub-bases
- Patio bases
- Hardcore fill
- Sand and gravel jobs
Aggregates Calculator
Enter your measurements below. Use metres for length and width, and millimetres for depth.
Your Result
The estimate will appear here.
Need materials for the job?
Use this estimate to compare prices from local aggregate suppliers.
Ask About Supplier ListingsAggregates Calculator FAQs
Quick answers for common aggregate estimating questions.
How do I calculate aggregate in tonnes?
Multiply length × width × depth to get cubic metres, then multiply by the material density. This calculator does that for you automatically.
Should I add wastage?
For most site jobs, adding around 10% allowance is sensible because ground levels, compaction and spreading can vary.
Is this exact?
No calculator can be perfect because aggregate density, moisture and compaction vary. Use this as a practical estimate before ordering.