Gravel Calculator
Estimate how much gravel you need for a driveway, pathway, patio or landscaping bed. Calculate cubic yards, cubic feet, estimated weight and material cost, with an adjustable waste allowance.
Your volume estimate will appear here.
How much gravel do I need?
Measure the area you want to cover and decide how deep the gravel layer should be. This calculator supports rectangular and circular areas. It converts your dimensions into cubic feet and cubic yards, then applies the waste percentage you select.
Gravel calculator formula
Rectangular volume: length × width × depth.
Circular volume: π × (diameter ÷ 2)² × depth.
Order volume: calculated volume × (1 + waste percentage ÷ 100).
Weight is estimated as volume in cubic feet × the bulk density you enter. Gravel density varies by stone type, grading, moisture and compaction, so use a supplier’s density or weight-per-yard figure whenever available.
Worked example
A 20 ft × 10 ft rectangular driveway area with a 3-inch layer has a base volume of about 1.85 cubic yards. With a 10% allowance, the planning quantity is about 2.04 cubic yards. Your actual tonnage depends on the material density.
Tips before ordering gravel
- Measure the finished area in several places if its edges are uneven.
- Confirm the recommended depth for the intended use and sub-base with a local contractor.
- Ask the supplier whether material is sold by short ton, metric tonne, cubic yard or bulk bag.
- Check whether delivery minimums, compaction and moisture affect the delivered quantity.
Frequently asked questions
How many cubic yards are in a cubic foot?
There are 27 cubic feet in one cubic yard.
What density should I enter?
Use the density supplied by your quarry or landscape supplier. The 100 lb/ft³ starting value is an editable planning assumption, not a specification for every gravel type.
Does the calculator include compaction?
The waste allowance is a separate input. It does not model soil conditions or compaction; ask your supplier or contractor how much additional material your project requires.
Can I use it for pea gravel?
Yes. Enter the supplier’s density for pea gravel to improve the weight estimate.
Related tool: Concrete Slab Calculator · Deck Material Calculator.
This tool provides an approximate material estimate, not an installation specification. Verify depth, base preparation, drainage and delivery quantities locally.