Gravel Calculator

About the Gravel Calculator

A gravel calculator estimates the volume and weight of gravel, crushed stone, pea gravel, or decomposed granite needed for any landscaping or construction project — driveways, garden paths, drainage beds, French drains, playgrounds, or decorative ground cover. Getting the quantity right saves money and prevents the frustration of mid-project shortages. Gravel is sold by the cubic yard (US) or cubic metre (metric), and each material has a different density: pea gravel weighs approximately 1.35 tons per cubic yard, while crushed limestone runs closer to 1.55 tons. Ordering too little stops your project; ordering too much leaves you with an expensive pile you cannot return. Our free gravel calculator accounts for area dimensions, desired depth, material density, and automatically adds a 10-15% overage recommendation to ensure you have enough material for settling and waste. It outputs both volume (cubic yards and cubic metres) and weight (tons and kilograms) so you can compare quotes from suppliers who use different units.

How It Works

Volume formula: Volume (cubic yards) = Length (ft) x Width (ft) x Depth (inches) / 324. The 324 divisor converts the depth from inches to feet (divide by 12) and the result from cubic feet to cubic yards (divide by 27): 12 x 27 = 324. For irregular shapes: break the area into rectangles, triangles, or circles, calculate each volume separately, then sum them. Example: a 12 ft x 40 ft driveway at 4-inch depth: Volume = 12 x 40 x 4 / 324 = 1,920 / 324 = 5.93 cubic yards. With 10% overage: 6.52 cubic yards. Weight: 6.52 yards x 1.4 tons/yard (crushed gravel density) = 9.1 tons. For metric: Volume (m3) = Length(m) x Width(m) x Depth(m). Recommended depths by application: decorative landscaping 2 inches, garden paths 2-3 inches, driveways 4-6 inches, drainage beds 6-12 inches.

Tips & Best Practices

• ✓Always add 10-15% overage to your calculated volume — settling, uneven subgrade, and minor miscalculations consistently cause projects to run short.
• ✓Landscape fabric under decorative gravel prevents weed growth from below and keeps gravel from gradually mixing into the soil over seasons.
• ✓Material selection guide: pea gravel (3/8 inch round) is comfortable for barefoot paths but shifts underfoot; angular crushed stone compacts firmly for driveways; decomposed granite is popular for formal garden paths.
• ✓A standard pickup truck bed holds approximately 0.5 cubic yards; a standard dump truck holds 10-14 cubic yards — factor this into delivery logistics for large projects.
• ✓French drains require clean gravel (washed, no fines): use 3/4 inch to 1.5 inch crushed stone to ensure adequate water flow through the drainage layer.
• ✓Compaction factor: gravel settles 10-20% after installation and traffic. For driveways, the finished depth should be 4 inches of compacted material, which means laying 4.5-5 inches before compaction.
• ✓Cost reference: bulk gravel delivered ranges from $15-75 per cubic yard depending on material type and your location. Bagged gravel from home improvement stores costs 3-5x more per cubic yard but is convenient for small areas.
• ✓Patio vs driveway depth: foot traffic areas need only 2-3 inches; vehicle traffic requires 4-6 inches of base gravel plus optional 2 inches of surface gravel for a total of 6-8 inches in high-traffic areas.

Who Uses This Calculator

Homeowners planning gravel driveways, garden paths, and landscape beds calculate material needs and get accurate supplier quotes. Landscapers estimate material quantities for client bids and project planning. Contractors specify drainage layer aggregate for construction projects. Property managers maintain large gravel parking areas and access roads. DIY gardeners install low-maintenance decorative ground cover to suppress weeds and retain soil moisture.