How to calculate a sandbox sand
Sandboxes need play sand that is washed and screened, and a small box takes less than a cubic yard.
- Measure the inside length and width of the box.
- Pick a depth of 6 to 12 inches.
- Read the cubic yards and the number of 50 pound bags.
- Cover the box when not in use to keep out animals and moisture.
Worked example
For a typical sandbox sand with length 5 ft, width 5 ft, depth 8 in, the volume is 16.67 cubic feet. Divide by 27 for 0.62 cubic yards. With a 10 percent allowance, plan for 0.68 cubic yards.
In sand, 0.62 cubic yards weighs about 0.83 US tons at a planning value of 2,700 pounds per cubic yard.
Sandbox Sand sizes and quantities
These common sizes are calculated with the same formula as the tool above, so you can find your number quickly.
| Size | Cubic feet | Cubic yards | With 10 percent extra | US tons |
|---|---|---|---|---|
| 4 by 4 ft, 6 in | 8.00 | 0.30 | 0.33 | 0.40 |
| 5 by 5 ft, 8 in | 16.67 | 0.62 | 0.68 | 0.83 |
| 6 by 8 ft, 10 in | 40.00 | 1.48 | 1.63 | 2.00 |
| 8 by 8 ft, 12 in | 64.00 | 2.37 | 2.61 | 3.20 |
Tips
- Use play sand labeled for children.
- A 50 pound bag is roughly 0.5 cubic feet.
- A cover keeps the sand clean and dry.
Common mistakes to avoid
- Using construction sand that is dusty or sharp.
- Making the box too shallow.
- Leaving the sand uncovered.
These figures are planning estimates. Real material varies in moisture, size, and compaction, so confirm weights and order quantities with your supplier.
Frequently asked questions
How many cubic yards do I need for a sandbox sand?
Multiply the dimensions in feet and divide by 27. The example above, length 5 ft, width 5 ft, depth 8 in, needs 0.62 cubic yards before waste.
How much extra should I order?
Add 5 to 10 percent for waste. Add more if the ground is uneven or the material is loose.
Can I enter inches and feet together?
Yes. Each box has its own unit selector, so you can mix feet and inches.
How much does sandbox sand material weigh?
0.62 cubic yards of sand weighs about 0.83 US tons as a planning value.