Gravel Calculator

This calculator determines the required weight (in short tons or metric tonnes) and volume (in cubic yards or cubic meters) of gravel, crushed stone, pea gravel, or aggregate needed for home and landscaping projects. It translates physical ground dimensions into exact commercial quantities for quarries and building supply stores.

Bulk vs. Bagged Formats: The tool supports both purchasing formats:

• Bulk delivery: Loose aggregate dumped by truck, priced and billed by the ton, tonne, cubic yard, or cubic meter.
• Bagged delivery: Pre-packaged bags (standard 50 lb bags in imperial mode, or 35 kg bags in metric mode) ideal for smaller garden paths and accessible transport.

1. Enter Length and Width: Measure the total footprint of the area to be covered (in feet or meters).
2. Enter Depth: Specify how thick the gravel layer should be (in inches or centimeters). Recommended depths:
   • Garden paths & decorative borders: 2 to 3 inches (5 to 8 cm).
   • Driveways & parking pads: 4 to 6 inches (10 to 15 cm), often placed over a compacted sub-base.
   • French drain trenches & soakaways: 8 to 12 inches (20 to 30 cm) around perforated pipe.
3. Select Delivery Format: Choose between "Bulk" or "Bags".
4. Check Material Density (Advanced): The calculator uses realistic defaults (100 lb/cu ft or 2,700 lb/cu yd in imperial; 1,600 kg/m³ in metric). You can customize this in the Advanced settings if your supplier provides a specific aggregate density.
5. Include Waste %: Add 10% to 15% to compensate for ground settling, compaction, and edge slope.

Gravel is measured by volumetric displacement and sold by mass (weight). The calculator converts depth to match length and width units, calculates base volume, applies the waste percentage, and multiplies by material density to determine total weight:

In imperial units, 1 cubic yard equals 27 cubic feet. At the default density of 100 lb/cu ft (2,700 lb/cu yd), one cubic yard weighs exactly 1.35 short tons (2,700 ÷ 2,000 lbs).

Imperial Example — Gravel Pathway: A 20 ft long by 10 ft wide walkway with 3 inches of gravel, default density (100 lb/cu ft = 2,700 lb/cu yd), and 10% waste:

• Depth conversion: 3 inches ÷ 12 = 0.25 ft
• Base volume: 20 ft × 10 ft × 0.25 ft = 50 cu ft (1.85 cu yd)
• Volume with 10% waste: 50 × 1.10 = 55.00 cu ft (2.04 cu yd)
• Weight with 10% waste: 55 cu ft × 100 lb/cu ft = 5,500 lbs = 2.75 short tons
• In 50 lb bags format: 5,500 lbs ÷ 50 lbs = 110 bags

Metric Example — Driveway Border: An area measuring 6.0 m long by 3.0 m wide with 8 cm depth, default density (1,600 kg/m³), and 10% waste:

• Depth conversion: 8 cm ÷ 100 = 0.08 m
• Base volume: 6.0 m × 3.0 m × 0.08 m = 1.44 m³
• Volume with 10% waste: 1.44 × 1.10 = 1.58 m³
• Weight with 10% waste: 1.584 m³ × 1,600 kg/m³ = 2,534.4 kg = 2.53 metric tonnes
• In 35 kg bags format: 2,534.4 kg ÷ 35 kg = 72.41 → 73 bags

Crushed aggregate packs down under tamping or vehicular rolling. Graded base materials with stone dust (such as Crusher Run or MOT Type 1) compact by 15% to 20%, whereas washed uniform gravel (like 3/4" clean pea stone) settles by approximately 10%. If laying gravel over bare uncompacted soil, small stones will naturally sink into the dirt under load, quickly thinning the surface layer unless geotextile landscape fabric is installed underneath.

Always plan for a 10% to 15% safety buffer. Subgrade ground is rarely laser-flat, and minor depressions across a 50-foot driveway quickly consume tons of aggregate. Running short requires a second delivery, which incurs another delivery charge and delays your project schedule.

• Skipping landscape fabric: Without heavy-duty woven geotextile fabric beneath your gravel, weeds will penetrate from below and gravel will sink into the subsoil.
• Spreading rounded gravel too deep: Round pea stone rolls under tires and shoes. If installed deeper than 2.5 to 3 inches without stabilization grids, vehicles will bog down.
• Confusing cubic feet with cubic yards: Remember that 1 cubic yard contains 27 cubic feet (3 × 3 × 3). Forgetting to divide cubic feet by 27 will massively overestimate bulk order size.
• Ignoring moisture weight: Quarried gravel stored outdoors absorbs rain water. Damp aggregate can weigh 5% to 10% more per volume than dry material.