Gravel Guide: Everything You Need to Estimate
To find how much gravel you need, multiply length × width × depth (in feet) for cubic feet, divide by 27 for cubic yards, then multiply by about 1.4 for tons. A 40×10 ft driveway at 4 inches deep needs about 4.9 cubic yards (≈ 6.9 tons), costing roughly $210–$415 delivered.
Get exact numbers
Use the free Gravel Calculator to estimate your project.
How to estimate gravel
Formula: Tons = (Length × Width × Depth ft) ÷ 27 × 1.4
- Measure the area. Record length and width in feet.
- Choose a depth. 4 in for footpaths, 6–8 in for a gravel driveway over a base.
- Find the volume. Multiply area × depth, divide by 27 for cubic yards.
- Convert to tons. Multiply cubic yards by about 1.4 for delivery weight.
Example: A 40 ft × 10 ft driveway at 4 in: 400 ft² × 0.333 = 133 ft³ ÷ 27 ≈ 4.9 yd³ × 1.4 ≈ 6.9 tons.
Common mistakes to avoid
Skipping the base layer
A gravel driveway needs a coarse base (#3) under the top layer (#57). Skipping it leads to ruts and sinking.
Going too shallow
Driveways need 6–8 inches total over a stable base. Less than that won't hold up to vehicle weight.
Forgetting fabric
Landscape fabric under the gravel stops it mixing into the soil and reduces weeds.
Not compacting
Compact each layer with a plate compactor — loose gravel migrates and washes away.