How this calculator works
A gravel driveway is two layers: a coarse, graded base that is compacted, and a finer top layer. Each is the area times its depth, converted to cubic yards and then to tons with the weight of the stone. The base gets 15% extra because loose stone compacts, and the top layer 10%.
Worked example: a 12 × 50 ft driveway (600 ft²) with a 4 inch base and a 2 inch top layer takes 12.8 tons of base stone and 5.7 tons of 3/4 inch crushed stone: 18.5 tons in all, about 1.5 dump truck loads, with 700 ft² of fabric.
Stone for common driveway lengths (12 ft wide, 4 in base, 2 in top)
Tons of stone, with allowances for compaction.
| Length | Base stone | Top layer | Total | Truckloads |
|---|---|---|---|---|
| 30 ft | 7.7 tons | 3.4 tons | 11.1 tons | 0.9 |
| 50 ft | 12.8 tons | 5.7 tons | 18.5 tons | 1.5 |
| 75 ft | 19.2 tons | 8.6 tons | 27.7 tons | 2.3 |
| 100 ft | 25.6 tons | 11.4 tons | 37.0 tons | 3.1 |
| 150 ft | 38.3 tons | 17.1 tons | 55.4 tons | 4.6 |
Tips before you buy
- Use angular crushed stone that locks together: a graded base such as crusher run, topped with 3/4 inch crushed stone. Round pea gravel and river rock shift under tires.
- Six inches in total is a minimum on good soil. Go deeper on soft or clay ground, and use fabric between the soil and the stone.
- Crown the driveway so that water runs off the sides, and do not let it run onto the road or a neighbor.
- Ask the supplier about delivery and spreading, and make sure the truck can reach the site and will not damage your lawn.
- Check local rules for a new driveway entrance or a culvert.
Tools & materials for this project
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Frequently asked questions
How much gravel do I need for a 12x50 driveway?
About 18 tons in two layers: 12.8 tons of base stone 4 inches deep, and 5.7 tons of 3/4 inch crushed stone 2 inches deep on top, with allowances for compaction and waste.
How deep should a gravel driveway be?
Six inches in total on good soil, in layers (a coarse base, then a finer top layer), and more on soft or clay ground. A 6 inch base on this driveway would take 19.2 tons.
What kind of gravel is best for a driveway?
Angular crushed stone that locks together: a graded base such as crusher run or road base, topped with 3/4 inch crushed stone. Round pea gravel and river rock shift under tires.
Do I need fabric under a gravel driveway?
Over soft or clay soil, yes: geotextile fabric stops the stone sinking into the ground and keeps weeds down. This driveway needs about 700 ft².
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Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.