Gravel volume: cubic metres, cubic yards and supplied density.
How do you convert a measured gravel volume into a rounded bulk order and estimated weight?
Convert depth before multiplying
A depth of 50 mm is 0.05 m. Multiplying 10 m² by 50 without converting millimetres would overstate the cubic-metre result by a factor of 1,000. For imperial measurements, convert inches to feet before multiplying square feet.
Cubic yards are another volume unit
One cubic yard is 0.764554857984 m³, derived from the exact 0.9144 m yard. The unrounded 0.55 m³ requirement is about 0.7194 yd³. Apply order increments in the supplier’s quoted unit rather than treating a quarter cubic yard as a quarter cubic metre.
Stock changes the order, not the measured area
If the same example has 0.1 m³ of compatible usable stock, remaining need is 0.45 m³ and the 0.25 m³ increment produces a 0.5 m³ order. At the same illustrative density, that order is 750 kg. Confirm stock and quoted material use comparable volume bases.
Use weight as an estimate with a named basis
The Gravel Calculator uses the supplied density; it does not determine that density from the material name. Moisture and the supplier’s volume basis can affect the input. An estimated mass does not establish safe handling or load limits.
Use the matching calculator
Use this decision sequence
- Multiply measured area by the supplied depth.
- Apply the entered allowance once.
- Subtract compatible available stock on the same volume basis.
- Apply the supplier’s volume increment, then calculate mass from supplied density.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Geometric volume | Area multiplied by the supplied depth. |
| Loose delivery volume | Must use the supplier’s stated basis. |
| Estimated mass | Order volume multiplied by compatible supplied density. |
Worked comparison
An illustrative 5 m × 2 m surface at a supplied 0.05 m depth needs 0.5 m³. A 10% entered allowance gives 0.55 m³. With no stock and a 0.25 m³ order increment, order 0.75 m³. At an illustrative supplied density of 1,500 kg/m³, estimated mass is 1,125 kg.
Check before using the estimate
Loose and compacted volume or density bases are not interchangeable.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-13. Methods and scope.