Gravel by project
How much gravel for a 3 x 3 m shed base?
A starting estimate for a 3 x 3 m base at 8 cm finished depth.
Estimated result
Pre-calculated from the example inputs below. Adjust them in the calculator for your own numbers.
- Volume
- 0.72 m3 (0.94 yd3)
- Weight
- 1.27 t (1.4 US tons)
- Bag count
- 64 x 20 kg bags
A 3 x 3 m shed base at 8 cm finished depth needs the volume, tonnes, and bag count shown below. Shed and load-bearing bases often use a compacted sub-base material rather than loose decorative gravel, so check the right aggregate for the job.
Example inputs used
- Length: 3
- Width: 3
- Depth: 8
- Aggregate density: 1.6
- Bag size: 20
These are starting values for this example. Measure or confirm your own figures, then open them in the gravel calculator.
Assumptions and limits
- Uses a typical gravel density of 1.6 t/m3; sub-base materials are denser.
- Includes a 10% waste and settling allowance.
- Load-bearing bases usually need a compacted sub-base, not loose gravel.
This is an estimate. Site conditions, compaction, and aggregate type can change the final quantity.