How Much Sand for a 4x4 Sandbox?
A 4 by 4 foot sandbox has 16 square feet of floor. Filled 10 inches deep, how much sand for a 4x4 sandbox comes to 13.3 cubic feet, or about 27 fifty-pound bags.
Volume and tonnage calculator →Sand by fill depth
| Fill depth | Cubic feet | 50 lb bags | Cubic yards |
|---|---|---|---|
| 6 in | 8.0 | 16 | 0.30 |
| 8 in | 10.7 | 22 | 0.40 |
| 10 in | 13.3 | 27 | 0.49 |
| 12 in | 16.0 | 32 | 0.59 |
A 50 lb bag of play sand holds roughly 0.5 cubic feet; check the bag, since brands differ.
Related: How Much Sand for a 10x10 Sandbox?
Fill depth
Leave a few inches of the frame showing to keep sand inside. Six inches is enough for toddlers; older kids dig deeper, so 10 to 12 inches is better.
Choosing the sand
Bagged play sand is washed and screened. For big boxes, bulk washed sand can cost less; make sure it is clean and soft, not a coarse concrete sand.
Related: How Much Sand for an 8x10 Sandbox?
Cover and drainage
A cover keeps out rain, leaves and animals. Put landscape fabric on the bottom so water drains while weeds stay out.
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.
Common mistakes
Using the wrong sand type is the big one: sharp concrete sand or sand with pebbles is uncomfortable and can damage liners. Another is skipping the ground prep, expecting sand to hide bumps and slopes. It does not; it shifts and washes out.
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 many bags of sand for a 4x4 sandbox?
About 27 bags of 50 lb at 10 inches deep.
How many cubic feet of sand for a 4x4 sandbox?
About 13.3 cubic feet at 10 inches.
How deep should sand be in a sandbox?
About 6 to 12 inches, a few inches below the rim.
How much does a bag of play sand cover?
A 50 lb bag is roughly 0.5 cubic feet.
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