Cubic Metres to Tonnes Decorative Stone Converter
Instantly calculate the weight in tonnes of gravel, slate, chippings, or aggregate based on volume and material density. Perfect for landscaping and construction projects.
Convert Your Stone Volume to Weight
Enter your project details below to get an instant, accurate estimate of how many tonnes of decorative stone you need based on your required cubic metre volume.
Stone Weight Estimator
Fill in your material and volume details to see your estimated weight
Selects the average density for the material
Length × Width × Depth (in metres)
Auto-filled, but editable for custom materials
Estimated Weight
Breakdown based on material density and volume
Average Decorative Stone Densities
Estimated average densities for common landscaping and construction aggregates. Actual weights may vary slightly based on moisture content and specific quarry source.
| Material Type | Avg. Density (Tonnes/m³) | Weight of 1 m³ |
|---|---|---|
| Gravel / Pea Shingle | 1.60 | 1.60 Tonnes |
| Slate Chippings | 1.50 | 1.50 Tonnes |
| Limestone / Cotswold Stone | 1.50 | 1.50 Tonnes |
| Granite / Decorative Rock | 1.65 | 1.65 Tonnes |
| Sharp Sand / Building Sand | 1.60 | 1.60 Tonnes |
Stone Conversion FAQ
Everything you need to know about calculating, ordering, and managing decorative stone for your project.
To convert cubic metres (m³) to tonnes, multiply the volume by the density of the specific material. For most decorative stones like gravel or slate, the average density is between 1.5 and 1.6 tonnes per cubic metre. Formula: Weight (Tonnes) = Volume (m³) × Density (Tonnes/m³).
Gravel and pea shingle typically have a density of around 1.6 tonnes per cubic metre. Slate chippings are slightly lighter, averaging about 1.5 tonnes per cubic metre, while dense granite can reach up to 1.65 tonnes per cubic metre.
Yes, it is highly recommended to order 10% to 15% more stone than your exact calculated volume. This accounts for natural compaction when the stone is walked or driven on, settling over time, and minor spillage during delivery and spreading.
Yes. Wet stone is heavier than dry stone because water fills the voids between the particles. The densities used in this calculator are for standard dry materials. If your stone is delivered wet or in rainy conditions, the actual weight may be 5% to 10% higher.