Sand Calculator

Sand sits underneath a lot of projects — the bedding layer for pavers, the base for a sandbox, the fill for a low spot, the ingredient in site-mixed mortar — and like all aggregates it is sold by weight but used by volume. This calculator works out the volume from your area and depth, then converts it to tons for ordering and bags for smaller jobs.

How sand quantity is calculated

Depth is the variable most jobs hinge on: a paver bedding layer is only an inch, while filling or leveling can be much deeper. Because depth is in inches and the area is in feet, it is converted before multiplying.

Measuring the area

• Paver or slab bedding: the full area of the paved surface, at about 1 inch deep.
• Sandboxes: length × width × the play depth, often 6–12 inches.
• Leveling and fill: the average depth across the area, not the deepest point.

Common sand depths

A worked example

A 12×12 ft paver patio with a 1 inch bedding layer of sand at 1.35 tons/yd³:

• Volume = 12 × 12 × 0.083 = 12 cu ft
• Cubic yards = 12 ÷ 27 = 0.44 yd³
• Tons = 0.44 × 1.35 = about 0.6 tons
• Or about 24 fifty-pound bags for a bagged purchase

Choosing the right sand

Sand is not one product. Coarse concrete or bedding sand is the right choice under pavers and as a mortar ingredient, because it compacts and drains well. Fine play sand is washed and safe for sandboxes but too fine for structural bedding. Polymeric sand is a specialty product swept into paver joints, where it hardens to lock the pavers and resist weeds — calculate that separately by joint area. Match the sand type to the job, not just the volume.

Bagged versus bulk

For a single paver patio or a sandbox, bagged sand from the hardware store is clean and easy. For larger leveling jobs or a big paver project, bulk delivery by the ton is far cheaper, provided you have somewhere for the truck to tip the load. The crossover is around half a cubic yard. Whatever the source, calculate the volume first — the related paver and gravel calculators size the rest of a typical hardscape build.

Sand is not one product

Reaching for whatever bag says 'sand' is a common and costly mistake, because the type matters as much as the amount. Coarse concrete or bedding sand, with its angular, varied grains, compacts and drains well — the right choice under pavers and slabs and as a mortar ingredient. Fine, washed play sand is soft and clean for sandboxes but far too fine for structural bedding, where it would hold water and shift. Mason's sand is fine and uniform for smooth mortar and grout. Polymeric sand is a specialty product for paver joints, not bedding. Tell your supplier what the sand is for and match the grade to the job.

Bedding sand under pavers and slabs

For a paver or slab patio, a screeded inch of coarse bedding sand sits on top of a compacted gravel base, giving a level cushion the units are set into. Getting this layer flat and consistent is what makes the finished surface even, so it is screeded carefully with a straightedge rather than just raked. The sand is not compacted before laying — the pavers are set into it and the whole surface compacted together afterward. The related gravel calculator sizes the base beneath the sand, and the paver calculator handles the surface above it.

Joint sand and stabilisation

After pavers are laid, sand is swept into the joints between them to lock them together and prevent shifting. Ordinary sand works but washes out and lets weeds and ants in over time. Polymeric sand, which contains a binder that hardens when dampened, resists washout, weeds and insects far better and is well worth the extra cost on a patio you want to stay tidy. Calculate joint sand separately by the joint dimensions and paving area, since it depends on joint width and paver thickness rather than the bedding depth.

Buying and handling

For a single sandbox or small paver patio, bagged sand from the home centre is clean, consistent and easy to carry. For larger leveling jobs or a big hardscape, bulk delivery by the ton is far cheaper, provided you have somewhere firm for the truck to tip the load and the willingness to barrow it. The crossover is around half a cubic yard. Keep bagged sand dry until use, and cover a bulk pile against rain, since saturated sand is heavy, messy and harder to screed evenly. Confirm the sand's density with the supplier if you need the tonnage exact.

Estimating cost and quantity

Sand is among the cheapest construction materials by weight, so the decision is mostly about convenience versus volume. Bagged sand is clean and easy for a sandbox or small paver patio; bulk sand by the ton is far cheaper for larger leveling and hardscape jobs, given somewhere for the truck to tip it. The calculator's volume and tonnage figures let you price both and choose. The more important decision is the type: paying a little more for the correct grade — coarse bedding sand under pavers, fine play sand for a sandbox, polymeric sand for joints — matters far more than shaving cents per bag, because the wrong sand undermines the whole project. A cubic foot is roughly two fifty-pound bags, and a cubic yard about fifty-four, useful benchmarks when deciding between bags and bulk. Order a little extra bedding sand, since screeding consumes more than the bare area suggests.