Plan patios and paths with precise joint fill. Compare units, density, and bag sizes fast. Download results, reduce waste, and order sand confidently now.
The calculator estimates the total joint length from a rectangular grid of pavers, then multiplies by joint width and joint fill depth to get joint volume.
Jointing sand locks pavers together, limits lateral movement, and reduces weed pressure. Under-ordering can delay finishing and produce uneven joints. Over-ordering increases cost and storage. A repeatable estimate supports better procurement, faster installation, and consistent compaction quality across patios, paths, and courtyards. For polymeric blends, correct coverage helps proper activation and reduces surface haze after watering.
Total paved area sets the number of pavers and the amount of joint length. Joint width and fill depth determine the cross‑section of each joint. Smaller pavers generally create more joints per square meter, while larger formats reduce joint length. Waste allowance captures sweeping losses, spillage, and topping-up after vibration. If your layout uses borders, soldier courses, or curved edges, joint length rises and grid assumptions shift slightly.
The model treats the surface as a rectangular grid. It estimates paver counts along length and width using a module size equal to paver dimension plus joint width. Internal joint length is the sum of all vertical and horizontal joint segments between pavers. Optional perimeter joints approximate the border gap against edging or restraints. This works for running bond and simple patterns; complex mosaics need a higher waste factor or joint length measured from the plan drawing.
Bulk density converts volume into weight for ordering. Dry jointing sand commonly falls near 1500–1700 kg/m³, while moisture can increase delivered weight without adding usable volume. Use the product datasheet when available. Bag size changes the purchase count; always round up to cover final sweep-in and touchups.
Verify joint depth after laying and before sweeping, because bedding level and chamfered edges can change the actual void. Compact pavers, sweep sand repeatedly, then compact again to settle joints. Refill until joints stay full after vibration. For permeable systems, confirm that the specified aggregate gradation matches the design.
Yes. The calculator estimates joint void volume. Use the correct bulk density and bag size for your product. For polymeric sand, keep joints clean and dry, then follow the manufacturer wetting and curing instructions.
Enter the depth of joint space you plan to fill, not the full paver thickness. Many installations fill the top portion of the joint. If you are unsure, measure a test joint after bedding and laying.
Some projects have tight edge restraints with minimal outer gaps, while others have wider border joints against edging or walls. Turning perimeter off can better match fully confined installations. Turning it on is safer when gaps exist.
Start with 5–7% for straight layouts and minimal cuts. Use 8–12% for many cuts, borders, or uneven surfaces. Increase further for complex patterns or if you expect multiple compaction passes and topping-up.
Area mode assumes a square footprint to estimate joint counts. It is useful for quick ordering, but irregular shapes can change joint length. For best accuracy, use length and width, or add extra waste for curves.
All calculations convert to a metric internal base for consistent unit handling. The results still include familiar outputs like liters, cubic feet, and pounds. Use the CSV for recordkeeping and the PDF for sharing with suppliers.
| Scenario | Project | Paver | Joints | Density | Waste | Output (approx.) |
|---|---|---|---|---|---|---|
| Patio | 6 m × 4 m | 200 mm × 100 mm | 3 mm wide, 25 mm deep | 1600 kg/m³ | 7% | ~0.14 m³, ~225 kg, ~9 bags (25 kg) |
| Path | 12 m × 1.2 m | 300 mm × 300 mm | 4 mm wide, 30 mm deep | 1550 kg/m³ | 10% | ~0.05 m³, ~78 kg, ~4 bags (20 kg) |
| Courtyard | 40 m² (area only) | 250 mm × 125 mm | 3 mm wide, 35 mm deep | 1650 kg/m³ | 8% | ~0.25 m³, ~413 kg, ~17 bags (25 kg) |
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.