Gravel weight = adjusted volume × material density
Full bags = gravel weight ÷ bag weight, rounded up
Example calculation
A 12 × 10 ft area at 3 in deep is 30 cubic feet before extra allowance. With 10% extra and gravel at 100 lb per cubic foot, the estimate is about 1.65 short tons or 66 full 50 lb bags.
Planning tips
Measure compacted depth, then allow for settlement and an uneven base.
Replace the default density with a supplier value when available.
Bulk delivery is usually more practical than bags for larger areas.
Common questions
Gravel calculator FAQ
How deep should gravel be?
Depth depends on the project and base conditions. Decorative paths may use a shallower layer than driveways, which commonly require a prepared base and multiple material layers.
How much does a cubic yard of gravel weigh?
Weight varies by stone size, moisture, and compaction. A common planning range is roughly 1.3–1.5 short tons per cubic yard, but supplier values are more reliable.
Does the calculator include compaction?
Use the extra allowance field to cover compaction, settlement, and minor grade variation. Confirm the final order with the material supplier.