Material calculator
Gravel Volume Calculator
Calculate gravel volume, then choose whether to estimate weight or bags.
Your measurements
Changing units changes the display, not the stored measurement.
Results
Example inputs
Your result will appear here
Enter the measurements and product details, then calculate.
These tools estimate material quantities from dimensions you choose. They do not specify structural depth or load capacity.
Describe the gravel layer
Enter the length, width and chosen depth of each rectangular section that will receive gravel. The tool multiplies length by width to obtain its area. Keep sections non-overlapping and leave uncovered parts outside the included rectangles; the form has no separate area-deduction field.
The calculator uses the depth you enter. It does not select a suitable driveway layer or apply an assumed compaction factor. If your supplier distinguishes loose and placed quantities, confirm which basis the supplied parameters describe before comparing them.
Calculate volume before weight
Area multiplied by depth gives net volume. A chosen allowance then produces the required volume. That calculation remains useful when the material’s density is unknown.
Add density only when you can support it
Weight is calculated from the entered volume and density. Leave density blank if you do not have a suitable value; a missing weight is more honest than an invented one. The available mass labels distinguish kilograms, metric tonnes and US short tons.
For an illustrative 20 m² area at a user-selected 0.1 m depth, net volume is 2 m³. A chosen 10% allowance gives 2.2 m³. If the user supplies a density of 1,600 kg/m³ for the relevant material basis, the corresponding required mass is 3,520 kg, or 3.52 metric tonnes. The example density is not a gravel default.
Use the actual package volume
If buying by volume per bag, enter that capacity and round the required volume up to whole bags. For example, 2.2 m³ divided by a user-entered 0.025 m³ per bag gives 88 bags. A weight-labelled bag needs a compatible mass calculation rather than being treated as 0.025 m³ automatically.
Keep the assumptions with the order
Save the material description, depth, density basis and purchasing unit. Do not combine lines with incompatible density or package specifications merely because both are called gravel.
Frequently asked questions
Why is weight unavailable?
The volume calculation can work without density. Add a suitable user-supplied density if you need weight; PackLedge does not assume that one cubic metre is one tonne.
Which ton should I choose?
Use the unit your supplier specifies. Metric tonnes and US short tons are different mass units and are labelled separately.
Sources and method
- PackLedge quantity methods
Original derivations using geometry, ratios, sums and whole-package rounding. Each calculator explains its assumptions and worked examples.
- NIST Guide to the SI — Conversion Factors ↗
Reference for unit conversions and clear identification of metric and customary units. Exact base-unit definitions are retained in calculations rather than rounded display factors.
- Your selected product label or technical sheet
The source for the coverage, mixed yield, density, package capacity, sheet dimensions or wallpaper repeat that you enter.