Construction
Gravel Calculator
Volume, tonnage, and bag count for a gravel area — with a 10% waste allowance.
Inputs
Gravel Calculator
Result
Gravel needed
1.3 t
- Volume
- 0.9 m³
- With 10% waste
- 1.43 t
- 25 kg bags (with waste)
- 58
How it's calculated
tonnes = length × width × depth × density (depth in m, density in t/m³)
Common questions
Loose vs compact — which do I use?
Use the loose figure when ordering delivered gravel and the compact figure when estimating final in-place volume after tamping.
Why add 10% for waste?
Compaction, spillage, and edge losses eat into your order. A 10% buffer keeps a small shortfall from stopping the job.
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