UK paving sand calculator
Paving Sand Calculator UK
Estimate kiln-dried or polymeric jointing sand from paving area, paver size, joint width, joint depth, and product coverage. The quick table gives kg and 20 kg bag benchmarks; use the calculator below for your actual layout.
Quick answer
- A 20 m2 block-paved area often needs roughly 60-100 kg of jointing sand, or 3-5 x 20 kg bags.
- Wider or deeper joints increase kg required even when the paving area stays the same.
- Always use the bag coverage chart for your paver size and joint dimensions before ordering.
Interactive estimator
Paving joint sand calculator
Example: 18 m2 needs about 3 bags, or 60 kg when using 20 kg packs at 7.9 m2 coverage per bag.
Change joint size and product coverage before ordering; the bag chart is more reliable than a generic kg-per-m2 rule.
Paving joint sand estimates
| Paving area | Joint width | Planning quantity | 20 kg bags | Check before ordering |
|---|---|---|---|---|
| 10 m2 | 2-5 mm | 30-50 kg | 2-3 | Paver and product chart |
| 20 m2 | 2-5 mm | 60-100 kg | 3-5 | Joint depth and pattern |
| 30 m2 | 2-5 mm | 90-150 kg | 5-8 | Cuts and sweeping loss |
Planning ranges only. Actual kg per square metre varies substantially with paver format, joint width, joint depth, and the selected kiln-dried or polymeric sand.
Calculate paving sand from joints
Area alone gives only a rough bag estimate. Joint width, joint depth, and paver dimensions determine how much open joint volume must be filled.
Enter the coverage printed on the bag when available. Product coverage is usually more reliable than a generic kg-per-square-metre rule.
Jointing sand is not bedding sand
Kiln-dried or polymeric jointing sand is brushed into the finished paving joints. Sharp sand or grit sand forms the screeded bedding layer below block paving.
Use the separate block paving sand calculator when you need cubic metres, tonnes, or bulk bags for the bedding layer.
Helpful next step
Use the result as an initial joint-sand order, then confirm bag weight and coverage on the selected product. For sharp-sand bedding, use the block paving sand calculator.