Paths & drainage
Gravel Calculator
Translate a path, driveway, or drainage bed into volume and weight using the density supplied for your chosen aggregate.
How to calculate it
- Measure compacted coverage length and width.
- Enter finished gravel depth.
- Use the supplier density for your exact stone size and moisture condition.
What the calculator is doing
Compacted volume = length × width × depth; order volume = volume × (1 + allowance %); weight = order volume × supplier density.
- Imperial volume is converted to cubic yards before multiplying by tons per cubic yard.
- Density varies with aggregate type, grading, and moisture; supplier data is more reliable than a generic default.
- Base and decorative surface courses should be calculated separately because depth and density differ.
Buying checklist
- Confirm whether dimensions describe loose or compacted material.
- Ask for density of the exact aggregate and grading.
- Calculate subbase and finish stone as separate layers.
- Check delivery access, vehicle capacity, minimum load, and placement location.
Common mistakes
Using one density for every stone
Washed gravel, crushed base, and decorative stone can have materially different bulk densities.
Combining layers
A path may use different aggregates and finished depths, so one blended calculation hides purchasing needs.
Ignoring delivery constraints
Weight can exceed trailer capacity or require a location that can safely support a loaded truck.
Frequently asked questions
Why is gravel sold by weight?+
Bulk suppliers commonly load by weight, while projects are measured by volume. Density connects the two and varies by aggregate.
Does the result include compaction?+
Use the waste allowance to cover compaction and an uneven base. Ask the supplier for a recommended compaction factor for large jobs.