Paver Sand Calculator
Enter your patio or path dimensions and this calculator works out the volume of bedding sand and joint-filling sand you need, then converts to cubic yards, tonnes, 50 lb bags, and an estimated material cost. Switch between imperial and metric, adjust the layer depth, and add a waste factor so you never run short.
How to calculate paver sand
The bedding sand calculation has four steps. First, measure the length and width of your paved area and multiply them together to get the total square footage (or square metres). Second, choose your screed depth - 1 inch (2.5 cm) is the industry standard; stay between 0.5 and 1.5 inches or the pavers may settle unevenly. Third, multiply the area by the depth to get the volume, then divide by 27 to convert cubic feet to cubic yards. Finally, add a compaction waste factor of 10-15% because some sand is always lost to spillage and compaction during installation. For joint sand, divide your total area by the coverage per bag (typically 50-100 sq ft per 50 lb bag depending on joint width).
Bedding sand vs. joint sand
Paver projects typically use two different sands. Bedding sand (also called concrete sand or C-33 sand) creates the 1-inch screed layer that the pavers sit on. It is coarser, compacts well, and provides a stable, flat surface. Joint sand fills the gaps between pavers after they are set. You can use fine masonry sand for traditional joints, but polymeric sand is now the preferred choice because it hardens when wet, locking the pavers in place and blocking weeds and ants. This calculator handles both: enter your area dimensions for the bedding volume, and toggle on joint sand to estimate how many bags you need for the gaps.
Sand quantities in depth
Once you have your cubic-yard figure, you can convert it to weight for ordering bulk material. Concrete sand weighs approximately 2,700 lb per cubic yard (or about 1,600 kg per cubic metre). Divide by 2,000 to get short tons. Most sand suppliers sell bulk material by the ton, so the weight figure is what you quote when ordering. If bulk delivery is not practical for a small project, the bag count output tells you how many 50 lb bags to buy instead. Note that a single cubic yard of sand weighs roughly 1.35 tons, so even a modest 100 sq ft patio at 1-inch depth needs about 0.5 cubic yards and 0.68 tons - enough to justify bulk delivery if you have a large project nearby.
Tips for a long-lasting installation
Sand depth is one of the most common installation mistakes. More sand does not mean more stability; it actually increases the chance of settling as the loose granules shift under load. The gravel base does the structural work - use 4 inches of compacted crushed stone for foot-traffic areas and 6 inches for driveways. Add a layer of landscape fabric between the gravel and sand to prevent mixing. Screed the sand flat with a straight board and two screed rails, then set pavers without walking on the screeded surface. After all pavers are placed, sweep joint sand into the gaps, compact the entire surface with a plate compactor (use a rubber pad to protect the paver faces), and sweep in more joint sand to fill any gaps opened by compaction.
Recommended sand depths by project type
| Project type | Sand depth | Notes |
|---|---|---|
| Standard patio / walkway | 1 inch (2.5 cm) | Most common; compact to final depth after setting pavers |
| Driveway (light vehicles) | 1 inch (2.5 cm) | Use a stronger gravel base (6 inches minimum) rather than more sand |
| Pool surround | 1 inch (2.5 cm) | Level meticulously; pooling water washes sand out |
| Irregular / curved design | 1-1.5 inch (2.5-4 cm) | Slight extra depth helps with intricate cutting and fitting |
| Commercial / heavy load | 1 inch (2.5 cm) | Increase concrete base, NOT sand depth, for heavier loads |
Industry-standard bedding sand depths for common paver projects. Always use compacted gravel as the base layer beneath the sand.
Frequently asked questions
How deep should the bedding sand layer be?
One inch (2.5 cm) is the industry standard. After compaction the sand should measure exactly 1 inch. To hit that target, start at about 1.25 to 1.5 inches before compaction. Never exceed 1.5 inches of uncompacted sand: a thicker layer causes the pavers to settle, rock, or shift. If your sub-base is uneven, fix it with more gravel - not more sand.
What type of sand should I use under pavers?
Use concrete sand, also sold as C-33 sand, coarse sand, or washed concrete sand. It has an angular grain structure that compacts well and locks together under load. Fine play sand or masonry sand is too soft for bedding - it shifts and washes out. For joints, use polymeric sand (which hardens when wetted and resists weeds) or fine masonry sand for a more traditional look.
How many bags of sand do I need for a 10x10 patio?
A 10x10 ft patio (100 sq ft) at 1-inch depth needs about 0.31 cubic yards of bedding sand, which is roughly 840 lb or 17 bags of 50 lb concrete sand (including 10% waste). For the joints, you would need approximately 1-2 bags of polymeric sand depending on joint width. Buying bulk sand by the yard is cheaper at this scale if a supplier delivers small quantities in your area.
Do I need sand under every type of paver?
A sand screed layer is standard for concrete pavers, natural stone flagging, clay brick, and most permeable pavers. Porcelain pavers on a residential patio sometimes use a mortar bed instead for a flatter finish. Stepping stones laid in a lawn may use a thin layer of sand or fine gravel just for leveling. Check the manufacturer's instructions for your specific paver product.
How much does paver sand cost?
Bulk concrete sand typically costs USD 25-60 per ton depending on your location, supplier, and delivery distance - roughly USD 35-80 per cubic yard. Bagged C-33 sand runs about USD 5-10 per 50 lb bag at most home-improvement stores, which works out to around USD 300-400 per ton - many times more expensive than bulk. Polymeric joint sand costs USD 25-50 per 50 lb bag. For projects over about 2 cubic yards, bulk delivery is almost always the more economical option.
Why do I need a waste/compaction factor?
Sand compresses when it is tamped down: the final compacted layer is thinner than the loose material you spread. There is also inevitable spillage when screeding and sweeping. A 10% waste factor is realistic for a simple rectangular area. If your project has curved edges, lots of cutting, or complex patterns, use 15-20% to avoid a second trip to the supplier.