How Much Sand Do I Need?

Sand turns up in more home projects than almost any other bulk material. It sits under pavers, fills sandboxes, smooths out lawns, cushions pipes in trenches and forms the base for above-ground pools. The trouble is that each of these jobs uses a different kind of sand at a very different depth, from a single inch under a patio to more than a foot in a play area. This guide works through those projects one by one so you can see how much sand you need for yours and which type to ask for.

The Basic Sand Calculation

Sand is measured the same way as any other loose material: area times depth gives volume. With the area in square feet and the depth in inches, divide by 324 to get cubic yards. Where that number comes from is covered in our cubic yard calculation guide, so here we will concentrate on the details that are specific to sand.

Choose the Right Type of Sand First

Ordering the wrong sand is a more common mistake than ordering the wrong amount. Names vary between suppliers and regions, so describe your project when you call and ask what they recommend.

How Much Sand for Common Projects

A paver patio

Pavers usually sit on a compacted gravel base topped with a thin, screeded bed of coarse sand, commonly about an inch deep. For a patio 14 ft by 16 ft, the area is 224 square feet, so the bedding layer needs 224 × 1 ÷ 324 = 0.69 cubic yards. Many people round up to a full yard, because the sand bed compacts a little when the pavers are vibrated into it and some is lost at the edges. The gravel underneath is a separate calculation, which our gravel guide explains.

The joints between pavers are filled afterwards, often with polymeric sand. That is sold in bags with a coverage chart on the label, based on paver size and joint width, so follow the manufacturer's figures rather than calculating a volume.

A hexagonal sandbox

Not every sandbox is square. A hexagon with 4-ft sides has an area of about 2.598 × 4 × 4 = 41.6 square feet. If the frame is 12 inches tall, you would normally fill it to around 10 inches so sand stays inside when children play. That works out to 41.6 × 10 ÷ 12 = 34.6 cubic feet, or 1.28 cubic yards. Play sand is often sold in 50 lb bags of roughly half a cubic foot, so you would need about 70 bags. At that size, a bulk delivery of washed play sand may be easier on your back and your budget.

Spot-leveling a lawn

Some homeowners use sand to fill shallow dips in a lawn, working it down into the grass so the blades poke through. Rather than covering the whole lawn, measure only the low patches. If several dips add up to 150 square feet with an average depth of an inch, you need 150 × 1 ÷ 324 = 0.46 cubic yards. Whether sand or soil is better for leveling depends on your existing soil, and our topsoil guide covers the soil-based approach.

An above-ground pool base

Many above-ground pool instructions call for a smooth layer of sand under the liner, often a couple of inches deep, extending slightly beyond the pool wall. For an 18-ft round pool with a base 20 ft across, the radius is 10 ft and the area is 3.1416 × 100 = 314 square feet. At 2 inches deep, that is 314 × 2 ÷ 324 = 1.94 cubic yards. Always check the depth and sand type your pool's manufacturer specifies before ordering.

Bedding for a pipe trench

Drainage and utility pipes are often bedded in sand to protect them from sharp stones. Picture a trench 40 ft long and 18 inches wide, with sand 4 inches below the pipe, around the 4-inch pipe itself and 6 inches above it, for 14 inches of sand in total. The trench section holds 40 × 1.5 × (14 ÷ 12) = 70 cubic feet. Subtract the pipe, which takes up about 3.5 cubic feet over that length, and you need roughly 66.5 cubic feet, or 2.46 cubic yards. Bedding depths for utilities are often set by local codes or the utility company, so confirm them first.

Why Damp Sand Takes Up More Room

Sand has an unusual habit called bulking. When it is slightly damp, a thin film of water holds the grains apart, and the same amount of sand takes up noticeably more space than it does when dry, sometimes 20 percent or more. Once it is soaked or compacted, it settles back down.

This matters in two ways. If you buy sand by weight, damp sand weighs more, so you get less actual sand per ton. If you measure a pile by eye, a damp heap can look bigger than it is. Neither changes the volume your project needs, but it is worth knowing when a delivery looks generous and then seems to shrink as you spread it. For the weight side of the equation, see our cubic yards to tons guide.

Bags or Bulk Sand?

Bagged sand is clean, dry and easy to store, which makes it ideal for small sandboxes, patching paver joints or a few square feet of leveling. It gets expensive quickly, though, and a cubic yard of half-cubic-foot bags means lifting more than 50 of them. The cubic feet guide lists how many bags of each size make up a yard.

For anything over about half a yard, it is worth getting a bulk price. Sand is dense, so a delivery truck is far easier than repeated trips with a car or small trailer. If the sand will sit for a while before you use it, cover the pile to keep rain off and stop it washing into drains.

Sand Estimating Mistakes to Avoid

• Using fine sand under pavers. Play sand and masonry sand are smoother and finer than the coarse concrete sand commonly used for bedding, and they may not hold pavers as firmly.
• Filling a sandbox to the brim. Leave a few inches below the top of the frame, and calculate for the depth you will actually fill.
• Measuring the outside of the frame. For sandboxes and raised play areas, measure the inside dimensions.
• Treating joint sand like bedding sand. Joint sand is bought by the bag using the coverage chart, not calculated as a layer.
• Using beach or unwashed sand. It may contain salt, shells or clay, which can cause problems for plants, pavers and play areas.

Frequently Asked Questions

What kind of sand is best for a sandbox?

Most people choose play sand, which is washed and screened to remove debris and fine dust. Look for products labeled for play use and check the packaging for any safety information.

How much sand do I need for a 12 × 12 paver patio?

A 12 ft by 12 ft patio is 144 square feet. A 1-inch bedding layer needs 144 × 1 ÷ 324 = 0.44 cubic yards, before any allowance for compaction and edges.

Can I use sand to level my lawn?

Many people do, especially on sandy soils or sports turf. On heavy clay soils, a soil or soil-and-compost mix is often preferred. Whatever you use, apply it in thin layers so the grass can grow through.

How do I calculate the area of a hexagon or octagon sandbox?

For a regular hexagon, multiply the length of one side by itself and then by 2.598. For a regular octagon, multiply the side length by itself and then by 4.828. Multiply the area by the fill depth in feet for cubic feet.

How much polymeric sand do I need?

It depends on the paver size, joint width and joint depth. Each brand prints a coverage chart on the bag, so measure your patio's area and use their figures to work out how many bags to buy.

Final Thoughts

Getting sand right comes down to two choices: the right type for the job and the right depth for that type. Once those are settled, the volume is simple arithmetic. The Sand Calculator works out cubic yards and tons for any shape, the Square Feet Calculator finds awkward areas, and the CY Calculator handles everything else. If sand is only one layer of a bigger project, our gravel and topsoil guides cover what goes underneath and around it.