MihsabaHow to use
Estimate gravel volume in cubic metres and tonnes from area, depth, bulk density and waste.
- Enter Area (m²).
- Enter Depth (cm).
- Enter Bulk density (t/m³).
- Enter Allowance (%).
- Calculate, then review the assumptions before purchasing.
How it is calculated
Example
An area of 50 m² at 5 cm depth plus 10% allowance gives 2.75 m³. At 1.6 t/m³ this is about 4.4 tonnes.
Important notes
Bulk density varies with gravel type, moisture, grading and compaction. Use the supplier’s value when converting volume to mass and account for settlement in the target depth.
Worked examples and interpreting results
An area of 50 m² at 5 cm depth plus 10% allowance gives 2.75 m³. At 1.6 t/m³ this is about 4.4 tonnes.
| Case | Calculation | Result |
|---|---|---|
| Volume | 50 × 0.05 × 1.10 | 2.75 m³ |
| Tonnes | 2.75 × 1.6 | 4.4 |
How to check the result
Bulk density varies with gravel type, moisture, grading and compaction. Use the supplier’s value when converting volume to mass and account for settlement in the target depth.
Frequently asked questions
Where should bulk density come from?
Use the supplier’s bulk-density value for the specific gravel and condition because tonnes per cubic metre are not universal.
Should I include waste?
Include an allowance when cuts, breakage or layout losses are expected. Use a percentage that fits your project rather than assuming one fixed rate.
Do the units need to match?
Yes. The calculator assumes the units stated beside each field, so convert measurements first when your source uses different units.