Gravel Calculator
Use our free gravel calculator to estimate the volume and weight of gravel needed for driveways, garden paths, drainage and landscaping. Enter your area dimensions and choose your gravel type — results appear instantly in cubic yards, cubic metres and tonnes.
How to Use This Calculator
- Select Imperial (ft/in) or Metric (m/cm).
- Enter the length and width of the area.
- Enter the depth (typically 3–6 inches for paths, 4–6 inches for driveways).
- Choose your gravel type — this affects the weight estimate.
- Results update immediately, including a +10% waste recommendation.
Gravel Volume Formula
Cubic Yards = Volume (m³) × 1.30795
Tonnes = Volume (m³) × Density (t/m³)
Density varies by gravel type: pea gravel ~1.4 t/m³, crushed stone ~1.5 t/m³, bank run ~1.6 t/m³, limestone ~1.55 t/m³.
Gravel Installation Tips
- Install edging boards or metal edging to contain gravel and prevent spread.
- Lay landscape fabric underneath to suppress weeds while allowing drainage.
- Compact each 2–3 inch layer with a plate compactor for maximum stability.
- Grade the surface with a 1–2% slope away from structures for drainage.
- Top up the surface layer annually — gravel typically needs replenishing every 2–3 years.
Frequently Asked Questions
How much gravel do I need for a driveway? +
For a standard driveway, use a depth of 4 inches (10 cm). Multiply length × width × 0.333 ft and divide by 27 for cubic yards. Our calculator handles this instantly — just enter your dimensions.
How deep should gravel be for a driveway? +
A gravel driveway should have 4–6 inches of compacted gravel. For areas with clay soil or heavy traffic, 6–8 inches is recommended. Use a base layer of larger crushed stone topped with smaller pea gravel.
How many tons of gravel do I need? +
The weight of gravel depends on the type. Crushed stone weighs roughly 1.5 tonnes per cubic metre (2,700 lb per cubic yard). Enter your dimensions and gravel type into our calculator for an accurate estimate.
What type of gravel is best for driveways? +
Crushed stone (#57 or #411) is ideal for the base layer. Pea gravel or crushed stone chips work well as the top layer. Avoid rounded river rock on slopes as it migrates easily.
How do I calculate gravel for a circular area? +
Find the area first: Area = π × radius². Then multiply by depth and divide by 27 for cubic yards. For a rectangular approximation, multiply the diameter by itself and use that as your length × width.