How do you calculate how much gravel is needed?

All you need to know is the size of the area you wish to cover, what depth of gravel or slate you require, and your post-code. The size information helps calculate how much gravel or slate you will require, while your post-code helps us calculate a cost estimate based on delivery. Try it yourself now.

Note: This calculator is only intended as a rough guide to help you approximate the likely volume of gravel, slate or other aggregates needed for your project.

Gravel & Slate Calculator FAQs

How much gravel do I need for my driveway?

Calculating an accurate estimate of how much gravel or aggregate you need for a driveway is simple with our gravel calculator. All you need to know is the desired length and width of the driveway, along with what gravel depth you need. You can get an estimate right now using the calculator above.

How much gravel do I need for my garden?

To calculate how much gravel you require for your garden, you must know the approximate area you are working with, and the desired depth. For gardens, this can be trickier as the shape may not be a simple square. We recommend extending this to make it a square, as it is better to order too many aggregates than too few.

What depth of gravel do I need?

You would usually lay a 10mm aggregate at a depth of 30-40mm, but on a driveway this would need to be at least 50mm. A 20mm aggregate would need to be at least 40-50mm deep, and at least 50-60mm on driveways. A larger aggregate will settle and bond together better than smaller ones. The depth you will need to select for your gravel or slate will always depend on the aggregate size and what the surface will be used for.

Example gravel estimate

We estimate an area of 5 metres by 5 metres, with a depth of 40mm, would require approximately three bulk bags of aggregates, slate chippings or gravel.

Can you use the gravel calculator for all aggregates?

Our gravel calculator can be used for most gravel and aggregates featured on our website.

Do you need assistance?

If you are ordering a large amount of gravel, aggregate or slate maybe you would like to discuss it with us on 0808 948 0619, as there may be transport savings to be made on orders over 15 bulk bags, or on a loose tipped load of 20 tonnes or more.