Updated
March 27, 2026
Reviewed against the current calculator logic, structured content, and internal linking used on BuildCostLab.
Aggregate volume tool
Gravel Calculator
Estimate gravel volume, tonnage, bulk bags, and rough cost for driveways, decorative areas, and base layers.
Methodology
Planning-first estimate
Use this calculator to build a rough material estimate, then confirm it against product coverage data, site conditions, and supplier pack sizes before you order.
Trust
How we publish
See the calculator methodology and editorial policy for the standards behind these pages.
Assumptions
Assumes known area and depth, typical density values, and a buyer deciding between tonnage and bulk-bag ordering.
Common mistakes
People often mix up loose depth with compacted depth, use the wrong density, or forget that decorative gravel and sub-base are ordered differently.
Best use cases
Useful for driveways, paths, decorative borders, and quick checks on bulk bag counts before contacting a supplier.
How to get a better estimate
Measure carefully, apply realistic waste, and sense-check the result against how the product is actually sold.
Before you buy
Round to whole buying units and compare product coverage before buying solely on sticker price.
UK and US note
Unit wording and supplier pack conventions differ between markets, but the estimating logic still starts with geometry, waste, and whole-unit ordering.
Final buying check
Before placing an order, compare product coverage, pack size, delivery cost, and whether buying one extra unit is safer than risking a shortfall.
Explore this topic cluster
Open the full Gravel and Aggregate Estimating hub to move from quick estimate to deeper guidance.
How much gravel do I need for a driveway?
Measure the area, choose the installed depth, convert to volume, and then apply the density to estimate tonnes or bags.
What changes the gravel tonnage?
Depth and density are the biggest variables, and small changes in either can move the total a lot.