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Aggregate and Gravel Calculator

Ensure you get the right amount of material for your project with the Howarth Timber Aggregate Calculator. Whether you’re laying a driveway, creating a garden path, or filling a space with decorative stones, this tool helps you accurately calculate how much aggregate you need.

Our gravel calculator makes it simple—just enter the length, width, and depth of the area you want to fill, and it will provide an instant estimate. No more guesswork when asking, "How much gravel will I need?" or "How much gravel do I need per square metre?"—our tool gives you precise results.

 

The calculator works with various materials, including gravel, pebbles, and slate chippings. Whether you need a slate chippings calculator for a decorative feature or a pebble calculator for a landscaping project, we’ve got you covered.

Save time, reduce waste, and ensure you order the correct amount of aggregate with the Howarth Timber Aggregate Calculator. Try it today for quick and easy planning!

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5 important facts to consider when calculating how much gravel you need per square metre

Depth of Coverage

The required depth of gravel depends on its use. For driveways, a depth of 50mm (2 inches) is recommended, while pathways and decorative areas may only need 25mm (1 inch). Deeper layers require more gravel.

Gravel Size and Type

Different types of gravel, such as pea gravel, crushed stone, or slate chippings, have varying densities and coverage rates. Larger stones need a greater depth for full coverage compared to smaller aggregates.

Compaction Factor

Gravel settles over time, especially under heavy use. It's advisable to add around 10-15% extra material to account for compaction and ensure full, lasting coverage.

Surface Area Measurement

Accurately measure the length and width of the area in metres. Multiply these values to get the total square metre coverage, which is essential for precise calculations.

Wastage Allowance

Always account for material loss due to spillage, uneven surfaces, or adjustments during installation. A buffer of 5-10% ensures you have enough gravel to complete your project without running short.

By considering these factors, you can confidently calculate the right amount of gravel for your project, ensuring efficient use and minimal waste.

How to Guides

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Find inspiration to transform your outside garden into a gorgeous sanctuary with raised flower beds, pathways and edging, and decorative elements with our 5 garden sleeper ideas article.

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Discover creative garden ideas using slate chippings, including pathways, decorative borders, water features, and more. Learn how to lay slate chippings and determine how much you need for a stunning, low-maintenance garden.

Frequently Asked Questions

How much aggregate do I need?
You would usually need a 10mm aggregate at a depth of 30-40mm. On a driveway it would need to be at least 50mm. Ultimately, a larger aggregate will settle and bond together better than smaller ones.
What is a type 1 aggregate?
Type 1 aggregate is an approved granular sub-base material that is created using recycled crushed concrete and rubble. It compacts well to form a solid base, making it a very good option for roads.
What are the different types of aggregate?
We have a wide variety of different types of aggregate at Howarth. For example, we have: Crushed stone and manufactured sand, gravel, which can be used for both garden and decorative aggregates, sand, which can be used for roads, and recycled concrete which is often used as a base layer for other construction materials.
What type of sand do I need to lay slabs?
We would recommend sharp sand to be able to lay slabs, as it is cost-effective and versatile.
What type of gravel do I need for under concrete slabs?
We would recommend a Type 1, as it is a subbase used to create a hardcore base for under patios, paving and driveways.
How much gravel do I need?
To work out how much gravel you will need, first start by measuring the length and width of the area in feet and multiply the figures together. Multiply your area figure by the depth of the gravel that you wish to use. If your depth is in inches, divide it by 12 first. You now have the cubic feet volume figure.
How deep should gravel be?
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 larger aggregate will settle and bond together better than smaller ones.

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