Gravel Calculator
Calculate exactly how much gravel, aggregates, or decorative stone you need for your project
Calculate Your Gravel Requirements
What These Results Mean
Estimated Costs
Gravel Depth Guide
The depth of gravel required depends on the size of the aggregate and the intended use. Correct depth ensures proper coverage, drainage, and longevity of your surface.
| Material Type | Recommended Depth (mm) | Best Used For |
|---|---|---|
| Gravel & Chippings (up to 20mm) | 50mm (minimum) | Driveways, paths, decorative areas |
| Small Pebbles (up to 20mm) | 50mm | Garden borders, decorative features |
| Medium Pebbles (up to 50mm) | 70mm | Feature areas, water features |
| Large Cobbles (up to 120mm) | 100mm | Decorative borders, rockeries |
Types of Gravel and Aggregates
Decorative Gravel
Decorative gravel comes in various colours and sizes, perfect for garden paths, driveways, and landscaping features. Popular options include cotswold chippings, slate chippings, and granite chippings.
Pea Gravel
Small, rounded stones typically 2-8mm in diameter. Excellent for pathways, play areas, and drainage applications. Its smooth texture makes it comfortable to walk on.
Crushed Stone
Angular fragments created by crushing larger stones. Provides excellent compaction and stability, making it ideal for driveways and base layers.
Slate Chippings
Flat, angular pieces of slate available in various colours including blue, green, and plum. Highly decorative and long-lasting, perfect for contemporary garden designs.
Project Planning Guide
Measuring Your Area
For rectangular areas, simply measure the length and width. For irregular shapes, break the area into smaller rectangles or use the largest rectangle that fits within your space.
Preparing the Ground
Proper ground preparation is essential for a long-lasting gravel surface. Remove existing vegetation, level the area, and consider installing a weed membrane before laying gravel.
Installation Tips
Spread gravel evenly using a rake, then compact lightly. For driveways, consider installing edging to prevent gravel migration. Water the surface lightly after installation to help settling.
Frequently Asked Questions
For a typical car driveway, measure the length and width in metres, then multiply by 0.05 (for 50mm depth). A standard single-car driveway (3m x 5m) requires approximately 0.75 cubic metres or about 1.2 tonnes of gravel.
Bulk bags (typically 850kg) are more cost-effective for larger projects and contain roughly 0.5 cubic metres of material. Small bags (20kg) are better for small projects or top-ups but cost more per tonne.
Break irregular areas into smaller rectangles and calculate each section separately. Alternatively, measure the largest rectangle that fits within your space and add 15-20% extra for the irregular edges.
Yes, this calculator works for most decorative aggregates including slate chippings, bark chippings, sand, and crushed stone. Adjust the depth setting based on your specific material requirements.
For garden paths with light foot traffic, 30-40mm depth is sufficient. For paths that will see regular use or wheelbarrow traffic, increase to 50mm depth for better stability and longevity.
Cost Considerations
Gravel costs vary significantly based on type, quality, and location. Decorative aggregates typically cost £80-150 per tonne, while basic gravel ranges from £25-50 per tonne. Delivery charges usually apply for orders under 10 tonnes.
Money-Saving Tips
Order in bulk to reduce per-tonne costs and delivery charges. Consider mixing different aggregate sizes for better compaction and reduced material usage. Local quarries often offer competitive prices compared to garden centres.