Gravel and Stone Calculator
How to Estimate Gravel for Your Project
Planning a driveway, patio base, or garden path requires an accurate estimate of materials to avoid overspending or running short mid-project. Our gravel calculator simplifies the math by converting your project's dimensions into volume and weight.
The Basic Formula:
To calculate gravel volume manually, use this formula:
(Length in feet × Width in feet × (Depth in inches / 12)) / 27 = Cubic Yards
Common Gravel Project Examples
- Garden Path: A 50-foot path that is 3 feet wide and 2 inches deep requires approximately 0.93 cubic yards of pea gravel.
- Driveway Refill: A standard 20′ x 20′ driveway needing a 3-inch top layer requires roughly 3.7 cubic yards (approx. 5.2 tons) of crushed stone.
- Flower Bed Base: A 10′ x 10′ area at 4 inches deep needs about 1.23 cubic yards.
Understanding Material Weight
Not all stones weigh the same. While the volume (cubic yards) remains the same regardless of material, the weight changes based on density. Standard landscaping gravel typically weighs 2,800 lbs per cubic yard (1.4 tons), whereas lighter volcanic rock or heavier granite screenings will vary the final tonnage required for transport.
Tips for a Successful Installation
1. Compaction: If you are using a vibrating plate compactor for a base layer, add 5-10% extra material to account for the stone settling and compressing.
2. Edging: Install your edging materials before the gravel arrives to ensure the stone stays contained within your measured area.
3. Weed Barrier: Always lay a heavy-duty landscape fabric beneath your gravel to prevent soil mixing and weed growth.