Road Base Material Calculator
Calculate the finished road base volume, convert it into a loose delivery quantity and estimate tonnes and truck loads from your pavement area and compacted layer thickness.
Road base inputs
Road base material requirement
Road base quantity method
The calculator starts from the finished compacted layer, then expands that requirement into a loose delivery volume using a user-supplied factor. This separates pavement geometry from material-state assumptions.
Loose volume = compacted volume × loose-to-compacted factor
Planning volume = loose volume × (1 + allowance)
Tonnes = planning volume × loose density
Worked example
At 1,200 m² and 200 mm compacted thickness, the finished base volume is 240 m³. With a 1.12 loose-to-compacted factor, the loose requirement becomes 268.8 m³ before the separate 4% allowance.
Why factors should remain visible
Aggregate compaction relationships are not universal constants. Keeping the factor visible makes the estimate easier to audit and replace with project-specific production data.
Thickness is a design input
The calculator does not decide whether 200 mm, 250 mm or another thickness is appropriate. Pavement design, loading, subgrade condition and project specifications determine the actual base-course thickness.
Limitations
This is a quantity estimate, not pavement structural design. Density, compaction factor and allowance should be supported by project or supplier information where accuracy matters.
Frequently Asked Questions
Can I calculate tonnes?
Yes.
Why enter a loose-to-compacted factor?
To distinguish finished volume from loose delivery quantity.
Does thickness come from the calculator?
No; thickness is a project input.
Can truck loads be estimated?
Yes, when truck payload is entered.