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Gravel calculator

Estimate the volume and weight of gravel needed to cover an area.

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Enter Area (m²), Depth (cm) and the Gravel calculator works out Volume (m³), Weight (tonnes) straight away. For instance, with Area (m²) = 20 and Depth (cm) = 5 it returns Volume (m³) = 1 and Weight (tonnes) = 1.6.

How to use it

  1. Enter your values: Area (m²), Depth (cm).
  2. Read the result instantly: Volume (m³), Weight (tonnes).

Frequently asked questions

How does the Gravel calculator work?

It takes Area (m²) and Depth (cm) and derives Volume (m³) and Weight (tonnes) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

2 values: Area (m²) and Depth (cm). Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Area (m²) = 20 and Depth (cm) = 5, the calculator returns Volume (m³) = 1 and Weight (tonnes) = 1.6. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Area (m²) = 22 and Depth (cm) = 6 instead, Volume (m³) goes from 1 to 1.32 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Area (m²) = 18 and Depth (cm) = 5, Volume (m³) comes out at 0.9. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Buying the right amount at the merchant: how many tiles, how much paint, how many bags of concrete, and what it all comes to.

What is the most common mistake?

Ordering the exact calculated quantity. Every material loses some of itself between the pallet and the finished job — offcuts, breakage, a bag that sets, a coat that soaks in further than the datasheet says — so add the allowance yours asks for, and order it in one delivery: a second batch rarely matches the first.

How accurate is it, and what are the limits?

Estimate only — confirm quantities with your supplier.

What is the difference between the Gravel calculator and the Pool volume calculator?

This one returns Weight (tonnes); the Pool volume calculator returns Volume (litres) and Volume (US gallons). That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Sand Calculator is the closest one after this: Estimate the volume and weight of sand needed to cover an area to a given depth.

Further reading

All guides →
How-toHow Much Gravel Do I Need?Multiply area by depth for a volume, then convert to weight — gravel is about 1.5 tonnes per cubic metre. Here's the method, depths by job, and how to order.How-toHow to Measure Roof PitchRoof pitch is rise over run, like 6:12. Here's how to measure it with a level, how to convert it to an angle or percentage, and why it matters.GuideMaterials for a Retaining Wall — And the Thing That Actually Makes Them Fall OverBlocks, base gravel, drainage stone, geogrid and pipe, counted from the calculator's own output. Then the number nobody puts in a materials list: a saturated backfill pushes about 2.2 times as hard as a drained one.How-toHow Much Mulch Do I Need?Multiply the bed's area by the depth you want. Here's the volume formula, how deep to spread it, bags vs bulk, and the cubic-yard version.GuideMulch Depth Is the Whole Answer — and It Is a Trade-OffTwo to four inches, and the right end of that window depends on the material: bark takes 3, screened compost takes 1 to 2, and gravel takes 1. Here is the depth trade-off, the settling nobody buys for, and the bag conversion where the count goes wrong.How-toHow Much Concrete Do You Need?Concrete is measured by volume: length × width × depth. Here's how to work out cubic metres, add for waste, and choose bags or ready-mix.