Gravel Calculator
EverydayCalculate how much gravel you need by volume and weight. Enter the area dimensions and depth to get cubic metres and tonnes required for your project.
Gravel Needed (tonnes)
1.8
Volume
1.125
Weight (kg)
1,800
What is a Gravel?
A Gravel Calculator works out how much gravel you need for a path, driveway, or landscaping project, based on the area you're covering and how deep a layer you want. Gravel is sold by weight in bulk quantities, but most people think about their project in terms of area and a desired layer thickness — this calculator bridges that gap, converting your measurements into both volume and weight.
This calculator handles the area-to-weight conversion using gravel's typical bulk density, with an adjustable density input for different gravel types. It pairs well with the Concrete Calculator and Square Footage Calculator for related material and area estimates.
How to use this Gravel calculator
- Measure the Length and Width of the area you're covering, in metres.
- Set the Depth you want the gravel layer to be, in centimetres — typically 5cm for paths, 7.5–10cm for driveways.
- Adjust the Gravel Density if your supplier specifies a different value than the default 1,600 kg/m³.
- Read the Gravel Needed (tonnes) result for the amount to order from a bulk supplier.
- Check Volume and Weight (kg) if you're comparing against bagged product sizes instead.
- Consider adding 5–10% extra to the result to account for settling and uneven ground.
Formula & Methodology
The calculator first computes volume, then converts to weight using density: Volume (m³) = Length × Width × Depth (converted to metres) Weight (kg) = Volume × Density Weight (tonnes) = Weight (kg) ÷ 1000 Worked example: for a 5m × 3m area with a 7.5 cm depth and standard 1,600 kg/m³ density: - Volume = 5 × 3 × 0.075 = 1.125 m³ - Weight = 1.125 × 1,600 = 1,800 kg - Weight in tonnes = 1,800 ÷ 1,000 = 1.8 tonnes
Frequently Asked Questions
The amount depends on the area you're covering and how deep a layer you want — multiply length × width × depth to get volume, then multiply by gravel's density to get weight. A typical driveway layer of 7.5 cm depth over a 5m × 3m area needs roughly 1.8 tonnes of standard gravel.
Footpaths typically use a 5 cm gravel depth, while driveways that need to support vehicle weight usually use 7.5–10 cm, sometimes with a compacted sub-base layer underneath. Deeper applications like soakaways or drainage layers may need significantly more.
Standard gravel typically has a bulk density of around 1,600–1,700 kg per cubic metre, though this varies by stone type and size — denser materials like crushed stone can reach 1,800–2,000 kg/m³, while lighter decorative gravel may be less. Check with your supplier for the specific material's density if precision matters.
Gravel layers are typically much shallower than the length and width of the area being covered, so centimetres give a more intuitive and precise way to enter a thin depth (like 5–10 cm) compared to working in fractional metres. The calculator converts everything to consistent units internally.
Many suppliers and contractors recommend ordering 5–10% extra to account for settling, uneven ground, and minor spillage during delivery and spreading. This is especially worth doing for larger projects where running short means an inconvenient second delivery.
Gravel is most commonly sold by weight (tonnes or kg) by bulk suppliers, though smaller bagged quantities at hardware stores are often sold by volume (litres or cubic feet). This calculator gives both volume and weight so you can match whichever unit your supplier uses.
Yes — different gravel types have different densities, so the same volume of two different materials can weigh noticeably different amounts. Adjust the Gravel Density input if your supplier specifies a density different from the default, to get an accurate weight estimate.
The [Concrete Calculator](/concrete-calculator/) estimates material quantities for mixed concrete (cement, sand, aggregate), while this Gravel Calculator estimates loose gravel for paths, driveways, or drainage layers that aren't being mixed into concrete. Both work from similar area × depth volume logic but apply to different materials.
Yes — the same volume and weight calculation applies whether you're covering a driveway, footpath, garden bed, or any other area with a gravel layer. Just adjust the depth to match what's appropriate for your specific landscaping use.
Check the weight printed on your gravel bags (commonly 20–25 kg per bag) and divide the calculator's Weight (kg) result by that figure to get the number of bags needed. For bulk deliveries, suppliers typically quote and deliver by the tonne directly.
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