Gravel Calculator
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.
- 1 yd³ gravel
- ≈ 1.4 tons
- Driveway depth
- 4–8 in
- 1 ton at 2 in
- ~100 ft²
Your measurements
4 in for paths, 6–8 in for driveways.
Enter your measurements
Fill in the fields to see your estimate.
The formula
Tons = (Length × Width × Depth ft) ÷ 27 × 1.4How to calculate it manually
- 1
Measure the area
Record length and width in feet.
- 2
Choose a depth
4 in for footpaths, 6–8 in for a gravel driveway over a base.
- 3
Find the volume
Multiply area × depth, divide by 27 for cubic yards.
- 4
Convert to tons
Multiply cubic yards by about 1.4 for delivery weight.
Example calculation
A 40 ft × 10 ft driveway at 4 in: 400 ft² × 0.333 = 133 ft³ ÷ 27 ≈ 4.9 yd³ × 1.4 ≈ 6.9 tons.
Gravel coverage by depth
Area one ton of gravel covers at each depth.
| Depth | Coverage per ton | Tons per 100 ft² |
|---|---|---|
| 2 in | ~100 ft² | ~1.0 |
| 3 in | ~67 ft² | ~1.5 |
| 4 in | ~50 ft² | ~2.0 |
| 6 in | ~33 ft² | ~3.0 |
Common gravel estimating mistakes
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.
Frequently asked questions
Related calculators
Ready to start your driveway & paving project?
Run the numbers above, then explore related tools and guides to plan every step.