About

In landscaping and foundation work, the "fraction" (stone size) critically dictates bulk density. Large stones (40-70mm) have larger air gaps between them compared to finer aggregates (5-10mm), resulting in a lower weight per cubic meter. This tool distinguishes between these fractions to provide a professional-grade estimate. It also integrates a cost calculator, as quarries bill by the tonne while site measurements are taken in cubic meters. Accurate conversion here ensures budget adherence for driveways, drainage fields, and concrete mixing.

Formulas

The cost calculation assumes a linear relationship between weight and price.

{

Weight = Vol × DensityTotal Cost = Weight × Priceper_tonne

Reference Data

Material	Fraction Size (mm)	Common Use	Density t/m³
Granite Crushed	5-10 mm	Concrete, Paths	1.38
Granite Crushed	20-40 mm	Driveways, Drainage	1.35
Granite Crushed	40-70 mm	Road Base	1.32
Limestone	5-20 mm	General Fill	1.30
Limestone	20-40 mm	Sub-base	1.28
Gravel (River)	Mixed	Decorative	1.45
Screenings	0-5 mm	Paver Base	1.55
Recycled Concrete	Mixed	Fill	1.15

Frequently Asked Questions

Yes. While the density of the rock itself (solid density) remains the same, the "Bulk Density" changes. Larger stones create larger voids (air pockets) when piled, effectively weighing less per cubic meter than smaller stones which pack tighter.

Typically, the "20mm" (or 5-20mm) fraction is used for the top layer of driveways as it locks together well. Larger fractions like 40-70mm are used for the sub-base foundation.

Recycled concrete aggregate (RCA) often contains traces of mortar and is more porous than virgin quarried stone like granite or basalt, resulting in a lower bulk density.

This is an estimate. Quarries weigh trucks on a weighbridge for the final bill. This tool helps you estimate that bill before the truck arrives.

Crushed Stone Cubic Meters to Tonnes Converter

Total Weight

Estimated Cost

About

Formulas

Reference Data

Frequently Asked Questions