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Gravel Bed Volume, Tonnage & Budget Calculator

Convert rectangular gravel-bed dimensions into material volume, tonnage and cost.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Edit a calculated value to solve backwards, or lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 6 by 3 meter bed with 20 centimeters of gravel contains 3.6 m³. At a custom density of 1,500 kg/m³ and 40 per tonne, it needs 5.4 tonnes costing 216.

Volume = length × width × depth; tonnes = volume × density ÷ 1,000 when density is in kg/m³

Worked example

Enter these known values and leave the other values blank.

Gravel type
Enter a custom gravel density
Density
1500 kg/m³
Length
6 m
Width
3 m
Depth
20 cm
Price per unit of mass
40 USD / t
Area
18 m²
Volume needed
3.6 m³
Weight needed
5.4 t
Price per unit of volume
60 USD / m³
Total cost
216 USD

Assumptions and limitations

  • Use a density that matches the volume being estimated. Loose delivered volume and finished compacted volume can differ. The calculation does not automatically adjust for settlement, compaction, delivery or minimum orders.
  • Enter dimensions, densities and prices that describe the actual project. Quantities absent from the formula are not added automatically.

Common questions

Should I use loose or compacted density?

Use a density that matches the volume being estimated. Loose delivered volume and finished compacted volume can differ. The calculation does not automatically adjust for settlement, compaction, delivery or minimum orders.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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