Construction
Gravel Calculator
Plan a gravel order from a rectangle, circle or measured area. Keep the finished layer separate from loose material, then compare volume, weight, bags, loads and optional supplier cost.
Turn project dimensions into an order quantity.
Inputs
Planning estimate; replace with your supplier's loose bulk density.
10% means order 1.10 × finished volume before waste; this is not a density conversion.
%Enter 0 to omit bags.
Enter 0 to omit loads.
Enter 0 to omit cost. Use your local currency.
Calculated locally in your browser. No sign-up or input upload.
Results
Loose gravel quantity
1.299 m³1.7 yd³45.887 ft³Covered area
15 m²161.459 ft²Finished layer volume
1.125 m³1.471 yd³39.729 ft³Estimated order weight
2.079 tonnes2.292 US tons2,079 kg4,583.41 lbWhole bags
84 bagsDelivery loads
1 loadsMaterial breakdown
- Finished layer → loose order
- 1.125 m³ × 1.155 = 1.299 m³
Assumptions & checks
Bulk density varies with grading, moisture and handling. Presets are editable planning estimates; confirm the supplier's density and order unit.
Compaction allowance adds loose volume. Do not apply a second supplier compaction factor to the same quantity.
Formula
Loose order volume includes independently entered waste and compaction allowances. Density applies to that loose order volume.
Worked example
Using the default values shown in the calculator, the same formula gives the following result. This is a quick sanity check for the calculation, not a design recommendation.
Inputs
- Project shape
- Rectangle
- Project length
- 5 m
- Project width
- 3 m
- Finished depth
- 75 mm
- Loose bulk density
- 1600 kg/m³
- Waste allowance
- 5 %
- Extra loose volume for compaction
- 10 %
- Weight per bag (optional)
- 25 kg
- Volume per delivery load (optional)
- 3 m³
- Supplier price (optional)
- 0
- Price per
- m³
Result
- Loose gravel quantity
- 1.299 m³
- Covered area
- 15 m²
- Finished layer volume
- 1.125 m³
- Estimated order weight
- 2.079 tonnes
- Whole bags
- 84 bags
- Delivery loads
- 1 loads
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Frequently asked questions
Are tons and tonnes the same?
No. A metric tonne is 1,000 kg; a US short ton is 2,000 lb. Both are labelled separately so the order matches your supplier.
How does reverse coverage work?
Available loose volume is divided by depth and both allowance factors. Weight is converted using the entered loose bulk density. Bags and loads are rounded up only at the order unit.