The short answer
Multiply length x width x depth in feet, divide by 27 to get cubic yards, then multiply by 1.4 to convert to US tons. A 4-inch layer over 500 sq ft is about 6.2 cubic yards, roughly 8.6 tons.
Gravel is sold by the cubic yard or the ton, but driveways are measured in feet and inches. Getting the conversion wrong means either a half-covered driveway or a pile you can't get rid of.
Step by step
- Measure the driveway length and width in feet.
- Choose a depth: 2-3 inches for a top-up, 4 inches for a new layer, 8-12 inches total for a full build in layers.
- Convert depth to feet by dividing inches by 12 (4 inches = 0.333 ft).
- Multiply length x width x depth to get cubic feet, then divide by 27 for cubic yards.
- Multiply cubic yards by about 1.4 to get US tons for suppliers who sell by weight.
- Add 5-10% for compaction and spillage before you order.
What you need
- Tape measure or measuring wheel
- Landscape fabric (optional, reduces sinking)
- Rake and steel tamper or plate compactor
What it costs
| Item | Typical cost |
|---|---|
| Crushed stone delivered (Varies by stone type and haul distance.) | $25-$65 per ton |
| Pea gravel | $35-$75 per ton |
| Delivery fee (Often free above a minimum tonnage.) | $60-$150 |
Common questions
How many tons of gravel are in a cubic yard?
About 1.4 US tons for typical crushed stone, though dense or wet material can reach 1.5 tons.
How deep should a gravel driveway be?
Plan on 8-12 inches total for a new driveway, built in 3-4 inch layers and compacted between each one. A refresh usually needs only 2-3 inches.
What size gravel is best for a driveway?
A compactable crushed base such as #57 stone topped with a smaller crushed layer. Round pea gravel looks good but shifts under tyres.