Gravel Calculator
Calculate the amount of gravel you need for paths, beds, drainage layers, driveways, and other landscaping projects.
What is the gravel calculator?
Calculate the amount of gravel you need for paths, beds, drainage layers, driveways, and other landscaping projects.
How to use the calculator
Enter the length and width of the area, then choose the installed depth. Enter a density when you need a weight estimate; gravel density varies by rock type, size, moisture, and compaction.
How to calculate gravel volume
Convert the depth to feet, multiply length × width × depth to get cubic feet, and divide by 27 to convert to cubic yards. Add a waste or overage allowance when ordering loose aggregate.
Cubic yards vs. tons
Landscape suppliers may sell gravel by the cubic yard or by the ton. Volume is determined by the space you need to fill; weight depends on material density. Two products occupying the same volume can have different weights.
Choosing a gravel depth
Depth depends on the purpose of the layer. A decorative bed, drainage layer, walkway, and driveway do not necessarily use the same thickness. Use the project specification or supplier recommendation rather than copying a generic depth.
Buying gravel
Bulk delivery is often more practical for larger projects, while bags can be useful for small repairs. Confirm whether the supplier quotes loose or compacted volume and whether delivery minimums apply.
How to improve the accuracy of your estimate
Use the actual product dimensions, package coverage, material density, installed depth, and current local price whenever those values are available. Measure the project in smaller sections when the shape is irregular, and keep fixed costs separate from area-based quantities. For a large purchase, compare the calculator result with the supplier’s own coverage or takeoff before ordering.
Common mistakes to avoid
The most common errors are mixing inches and feet, using nominal dimensions instead of actual product dimensions, forgetting waste or overage, treating volume and weight as interchangeable, and assuming a universal installation depth. Enter the values from your actual product and project specification whenever possible.
Worked planning example
A 20 × 10 ft area at 4 inches deep is 800/12 cubic feet, or about 2.47 cubic yards before waste. The calculator adds your selected waste allowance and uses the density you enter for an estimated weight.
Useful Gravel reference values
| Use | Planning note |
|---|---|
| Decorative gravel | 1–2 in typical planning range |
| Garden/path layer | 2–3 in typical planning range |
| Driveway surface | 4+ in depending on base and use |
| Drainage stone | Project-specific |
Reference values are planning aids. Product specifications and local conditions take precedence.
Frequently asked questions
How many tons of gravel do I need?
Calculate the required cubic feet and multiply by the product density, then divide by 2,000 to estimate US tons. Use the supplier density for the exact aggregate.
How many cubic yards are in a ton of gravel?
There is no single conversion because gravel density varies. A cubic yard of aggregate can weigh substantially more or less depending on material and moisture.
Should I add extra gravel?
Yes, some overage is sensible because of uneven subgrade, spillage, compaction, and material loss. Use the waste field rather than assuming a fixed percentage.
Can I use this calculator for an irregular project?
Yes, but the best approach is to divide the project into measurable sections and combine the results. Irregular edges, curves, openings, and changes in depth can make a single rectangular measurement less accurate.
What should I verify before buying materials?
Verify the product label or manufacturer coverage, actual dimensions, density or package yield, required installation depth, and supplier delivery terms. For structural or regulated work, also verify the project specification and local requirements.