Total Gravel Required
0 tonnes
0 m³
Calculate Aggregate & Gravel Quantities for Your Project
Professional Gravel Estimation Tool for UK Construction
Our gravel calculator helps you accurately determine the quantity of gravel, aggregate, or decorative stone needed for driveways, pathways, landscaping, and construction projects. Whether you're planning a new driveway, garden path, or drainage project, calculating the correct volume prevents over-ordering and saves money while ensuring you have sufficient materials to complete the job.
Gravel and aggregate are measured in tonnes, cubic meters (m³), or cubic yards. Our calculator converts between units and accounts for material density based on gravel type. Use this tool alongside Quarry Products Association UK guidelines and Royal Horticultural Society recommendations for landscaping applications.
Calculate required gravel quantity for your project
Gravel and aggregate calculations follow industry standards for bulk density, coverage rates, and application depth. The Quarry Products Association provides guidelines for aggregate specifications used in our gravel calculator. Material density varies by stone type, size, and moisture content, affecting total quantity requirements.
| Application | Minimum Depth | Recommended Depth | Base Layer Required |
|---|---|---|---|
| Garden Paths (Pedestrian) | 30mm (3cm) | 50mm (5cm) | Optional - membrane only |
| Decorative Borders | 40mm (4cm) | 60mm (6cm) | Not required |
| Driveway (Light Use) | 50mm (5cm) | 75mm (7.5cm) | 100mm MOT Type 1 |
| Driveway (Regular Cars) | 75mm (7.5cm) | 100mm (10cm) | 150mm MOT Type 1 |
| Heavy Vehicle Access | 100mm (10cm) | 150mm (15cm) | 200mm+ MOT Type 1 |
| Drainage Projects | 100mm (10cm) | 150mm (15cm) | Geotextile membrane |
| Soakaway Fill | 300mm (30cm) | 500mm (50cm) | Membrane wrapped |
| Playground Surfaces | 75mm (7.5cm) | 100mm (10cm) | Compacted subgrade |
Different gravel types suit specific applications based on size, appearance, and structural properties. Our gravel calculator accounts for density variations between materials to provide accurate tonnage calculations for your project needs.
Size: 8-10mm rounded stones
Density: 1.6 tonnes/m³
Applications: Garden paths, decorative borders, play areas, drainage
Advantages: Soft underfoot, attractive appearance, good drainage
Cost: £40-60 per tonne
Size: 20mm angular aggregate
Density: 1.75 tonnes/m³
Applications: Driveways, parking areas, pathways
Advantages: Excellent compaction, locks together well, durable
Cost: £25-40 per tonne
Size: 20-40mm various shapes
Density: 1.5 tonnes/m³
Applications: Landscaping, garden features, borders
Advantages: Attractive colors, weed suppression, low maintenance
Cost: £60-120 per tonne
Size: 20mm or 40mm
Density: 1.65 tonnes/m³
Applications: Driveways, paths, decorative areas
Advantages: Bright appearance, good drainage, affordable
Cost: £30-50 per tonne
Size: 10-20mm angular
Density: 1.8 tonnes/m³
Applications: Heavy-duty driveways, commercial areas
Advantages: Extremely durable, weather resistant, premium finish
Cost: £50-80 per tonne
Size: 20-40mm
Density: 1.4 tonnes/m³
Applications: Premium landscaping, contemporary gardens
Advantages: Attractive colors (blue, green, plum), long-lasting
Cost: £80-150 per tonne
Size: 0-40mm crushed aggregate
Density: 2.0 tonnes/m³
Applications: Sub-base for driveways, roads, hard standings
Advantages: Superior compaction, structural strength
Cost: £15-25 per tonne
Size: 0-40mm recycled aggregate
Density: 1.9 tonnes/m³
Applications: General fill, sub-base for paths
Advantages: Cost-effective, environmentally friendly
Cost: £12-20 per tonne
Accurate density values are essential for converting volume (m³) to weight (tonnes). Our gravel calculator uses industry-standard densities, but actual values may vary slightly based on moisture content and compaction.
| Material Type | Size (mm) | Density (tonnes/m³) | Coverage (m² per tonne at 50mm) |
|---|---|---|---|
| Pea Gravel | 10mm | 1.60 | 12.5 m² |
| Crushed Stone | 20mm | 1.75 | 11.4 m² |
| Decorative Gravel | 20-40mm | 1.50 | 13.3 m² |
| Limestone Chippings | 20mm | 1.65 | 12.1 m² |
| Granite Aggregate | 20mm | 1.80 | 11.1 m² |
| Slate Chippings | 40mm | 1.40 | 14.3 m² |
| MOT Type 1 | 0-40mm | 2.00 | 10.0 m² |
| MOT Type 2 | 0-40mm | 1.90 | 10.5 m² |
| Sand (Sharp) | Fine | 1.60 | 12.5 m² |
| Ballast | Mixed | 1.70 | 11.8 m² |
Proper installation ensures gravel remains stable, drains effectively, and looks attractive for years. Follow these professional steps when using quantities from our gravel calculator to achieve optimal results.
Excavation: Remove topsoil, vegetation, and debris to required depth
Level ground: Create even surface with slight fall for drainage (1:60 slope)
Compact subgrade: Use plate compactor or roller for firm base
Check levels: Ensure finished surface will be at correct height
Choose edging: Timber, metal, brick, or concrete edge restraint
Set height: Edge should be level with finished gravel surface
Secure firmly: Stake or concrete edging in place
Check alignment: Straight lines and smooth curves as required
Weed membrane: Lay geotextile fabric across entire area
Overlap joints: 100mm minimum overlap, secure with pins
MOT Type 1: Install and compact hardcore base for driveways
Check depth: Leave room for final gravel layer
Distribute evenly: Spread gravel to consistent depth
Rake level: Create smooth, even surface
Check coverage: Ensure no membrane visible
Light compaction: Settle gravel with roller or foot traffic
Surface fall: 1:60 gradient away from buildings
Soakaway: Install if required for large paved areas
Channel drainage: Consider for heavy rainfall areas
Permeable surface: Gravel allows natural drainage
Top-up: Add extra gravel to low spots
Rake regularly: Maintain level surface and appearance
Weed control: Apply membrane and occasional treatment
Annual refresh: Add new gravel layer every 2-3 years
✅ Professional Installation Tips:
Gravel costs vary significantly based on material type, quantity ordered, and delivery distance. Bulk loads are more economical than bagged products. Use our calculator to determine tonnage, then compare local aggregate suppliers for best pricing.
| Gravel Type | Price per Tonne | Bulk Bag (850kg) | Small Bag (25kg) |
|---|---|---|---|
| MOT Type 1 (Sub-base) | £15-25 | £25-35 | £3-5 |
| MOT Type 2 (Recycled) | £12-20 | £20-30 | £2.50-4 |
| Crushed Stone 20mm | £25-40 | £35-50 | £4-6 |
| Pea Gravel 10mm | £40-60 | £50-70 | £5-8 |
| Limestone Chippings | £30-50 | £40-60 | £4.50-7 |
| Granite Aggregate | £50-80 | £65-95 | £7-10 |
| Decorative Gravel | £60-120 | £75-140 | £8-15 |
| Slate Chippings | £80-150 | £95-175 | £10-18 |
💰 Cost Saving Tips:
Understanding the mathematics behind our gravel calculator helps verify results and adjust for unique project requirements. These formulas work for any measurement unit (convert to consistent units first).
📊 Calculation Formulas:
Dimensions: 15m long × 3m wide
Gravel depth: 75mm (0.075m)
Material: Crushed stone 20mm
Density: 1.75 tonnes/m³
Wastage: 10%
Formula: L × W × D
Calculation: 15 × 3 × 0.075
Base volume: 3.375 m³
With wastage: 3.375 × 1.10
Total volume: 3.71 m³
Formula: Volume × Density
Calculation: 3.71 × 1.75
Total weight: 6.49 tonnes
Round up: Order 7 tonnes
Estimated cost: £175-280 (£25-40/t)
MOT Type 1 depth: 150mm (0.15m)
Volume: 15 × 3 × 0.15 = 6.75 m³
Density: 2.0 tonnes/m³
Weight needed: 13.5 tonnes MOT
Estimated cost: £200-340 (£15-25/t)
⚠️ Common Calculation Mistakes: