How This Calculator Works
Gravel is sold by the cubic yard, ton, or bag, but most projects start with a length, width, and depth. This calculator converts those measurements into practical buying units.
Formula
Gravel volume = length x width x depth in feet. Cubic yards = cubic feet / 27. Tons = cubic yards x tons per cubic yard.
Assumptions
The default density is 1.4 tons per cubic yard, a useful planning value for common gravel. Supplier density varies by stone type, moisture, and compaction.
Measurement Checklist
- Measure the compacted area and depth for each gravel layer separately.
- Use supplier density when converting cubic yards to tons because stone type and moisture change weight.
- Add more overage for compaction, uneven excavation, or irregular edges.
- Separate base rock from decorative top layers when they use different depths or materials.
Practical Examples
- A 20 ft by 10 ft gravel area at 4 inches deep with 10% overage needs about 2.72 cubic yards, or about 3.80 tons at 1.4 tons per yard.
- A 40 ft by 3 ft path at 3 inches deep with 10% overage needs about 1.22 yd^3, or about 1.71 tons at 1.4 tons per yard.
- A 12 ft by 16 ft shed base at 4 inches deep with 10% overage needs about 2.35 yd^3, or about 3.29 tons.
- A 20 ft by 20 ft driveway top layer at 2 inches deep with 10% overage needs about 2.72 yd^3, or about 3.80 tons.