Gravel Calculator
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Calculate gravel volume, tonnes, and bag count from area, depth, aggregate type, and waste factor.

Before you order

- Measure the finished area after edging or borders are planned.
- Choose depth based on the intended use, not only appearance.
- Confirm aggregate density and bag size with the supplier.
- Compare small bags, bulk bags, and loose delivery for larger jobs.
- Check whether the supplier quotes by kg, tonnes, bulk bags, or cubic metres.
- Confirm where the delivery can be dropped and how far the gravel must be moved.
- Keep a note of the length, width, depth, density, bag size, and allowance used.
- For driveways or bases, confirm sub-base, compaction, and drainage requirements before ordering.

When this estimate may be wrong

- Uneven ground, compaction, and sub-base requirements can change the final quantity.
- Irregular shapes need separate area measurements or a conservative allowance.
- Driveways and load-bearing areas may need construction guidance beyond decorative gravel depth.
- Bulk bags are not always the same weight, even when they look similar in product photos.
- Moist aggregate can weigh more than dry aggregate, so supplier figures should take priority.
- Large stones may need a deeper layer than small decorative chippings to give even coverage.

Before ordering gravel

Check the depth for the intended use, measure the actual finished area after edging, and compare small bags with bulk-bag or loose-load delivery. For driveways, shed bases, and other load-bearing jobs, confirm the sub-base and drainage build-up before treating the decorative gravel quantity as the whole job.

Disclaimer

This is an estimate. Site conditions, compaction, and aggregate type can change the final quantity.