How Much Sand for an 18x36 Oval Above Ground Pool?

How much sand for an 18x36 oval above ground pool: about 3.57 cubic yards, roughly 4.8 tons, for the common 2-inch base. The pool footprint is about 578 square feet.

Volume and tonnage calculator →

Footprint math

The oval is a rectangle with a half circle at each end: width × straight section, plus a full circle with the pool’s width as its diameter. At 2 inches (0.167 ft) the volume is 96.4 cubic feet, or 3.57 yards.

Sand by depth

Sand depth	Cubic yards	Tons	50 lb bags
1 in	1.79	2.4	97
2 in	3.57	4.8	193
3 in	5.36	7.2	290

Don’t forget the cove

Most vinyl-liner pools use a sand cove: a sloped ridge of sand around the inside of the wall that keeps the liner from slipping under the wall. Add about 10 to 20 percent more sand for the cove, depending on the manufacturer’s spec.

Level the ground first

The sand layer is a cushion, not a fix for uneven ground. Level the site by digging down the high side rather than filling the low side, and compact it. Pools need to be very close to level; a tilt shows plainly in the waterline.

Which sand

Masonry or mason sand is fine-grained and smooth under a liner. Avoid sand with sharp stones. Some owners add a foam or felt pad on top of the sand to protect the liner.

Measuring the area

Measure the footprint in feet, multiply for square feet, then multiply by the depth in feet. Divide cubic feet by 27 for cubic yards. Round shapes use 3.1416 times the radius squared. Measure twice; a small mistake in diameter changes the total more than you might expect.

Keeping it in place

Plan for some loss each season from splashing, digging and rain. A sturdy border, a fitted cover and fabric underneath keep the sand clean and contained, so you top it up less often.

Bags vs bulk

Bagged sand is convenient for small jobs and easy to carry in a car. Once you pass about half a cubic yard, bulk sand from a landscape supplier usually costs much less. Ask whether the bulk sand is washed and screened.

Questions people ask

How much sand for an 18x36 oval pool?

About 3.57 cubic yards, roughly 4.8 tons, at 2 inches.

How many bags of sand for an 18x36 oval pool?

About 193 bags of 50 lb for a 2-inch base, plus extra for the cove.

How thick should sand be under an above ground pool?

About 2 inches is common; follow your pool manufacturer’s guide.

What sand is best under a pool?

Fine mason sand without stones.

Can sand level an above ground pool?

No. Level the soil first; the sand is a cushion layer.

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