Sharp Sand Calculator
Calculate how much sharp sand you need for patios, paving slabs, artificial grass, screeding and general building work. Get results in m³, kg, tonnes and bags — including wastage.
Enter your dimensions
Enter custom depth or pick a preset above
Covers cuts, breakages and uneven ground. 10% is a typical starting point.
Advanced options (optional)
Default 850kg. Check with your supplier.
Leave blank to use default 1.6 t/m³
Sharp sand estimate
Enter length, width and depth to see your sharp sand estimate
Typical sharp sand depths by application
| Application | Typical depth | Notes |
|---|---|---|
| Patio / paving slab bed | 30–40mm | Compact before laying |
| Paving slab (thicker flags) | 40–50mm | Depends on substrate |
| Artificial grass laying course | 20–25mm | Over MOT Type 1 sub-base |
| Levelling course | 25mm | Screed to level only |
| Sand:cement screed bed | 65–75mm | Traditional wet screed |
How to calculate sharp sand
The basic calculation is area × depth = volume, then multiply volume by the sand density to get weight. Sharp sand has a typical loose density of around 1.6 t/m³, though this varies slightly by source.
Always add a wastage factor — typically 10% for regular areas, more for awkward shapes or if you are back-filling unevenly. This calculator applies your chosen wastage percentage to the volume before calculating weight.
Related calculators
Calculate MOT Type 1, sharp sand, grano dust, weed membrane and pins for an artificial grass base.
Calculate MOT Type 1 in tonnes and bulk bags for patios, driveways and sub-bases.
Work out gravel in tonnes and bulk bags for driveways, paths and garden borders.
Calculate how many patio slabs you need, including wastage and pack counts.
Frequently asked questions
Planning estimates only
These results are estimates for planning purposes only. Actual material quantities can vary based on site conditions, compaction, wastage, product size, installation method and supplier guidance. For structural, safety-critical or regulated work, always consult a qualified professional.