🪣 Sandbox Sand Calculator
Choose a rectangular or round sandbox, enter its dimensions and fill depth, and estimate the play sand needed in cubic feet, pounds, and the number of 50-lb bags to buy.
🪣 Estimate Your Sandbox Sand
What is a Sandbox Sand Calculator?
A sandbox sand calculator turns a box's size into a shopping list: how much play sand it holds in cubic feet, the weight in pounds, and how many 50-lb bags to grab. It handles both rectangular boxes and round ones, using the right area formula for each shape.
Enter the dimensions in feet and a fill depth in inches (4 to 6 inches is common for play). The tool assumes dry play sand at about 100 lb per cubic foot and rounds bags up. These are estimates for planning; buy a little extra, since sand settles and gets scooped out over time.
❓ Frequently Asked Questions
How much sand do I need for a sandbox?
Multiply the sandbox area by the fill depth. A 5 ft × 5 ft box filled 6 inches deep needs 5 × 5 × (6 ÷ 12) = 12.5 cubic feet of sand, which is about 1,250 lb, or roughly 25 fifty-pound bags. For a round box, the calculator uses the circle area (π × radius²) instead.
How deep should the sand in a sandbox be?
Around 4 to 6 inches is typical for a play sandbox — deep enough for digging and building, shallow enough to stay tidy and dry out. Toddler boxes can be shallower. Deeper fills use a lot more sand, so the depth you choose has a big effect on how many bags you buy.
What kind of sand is safe for a sandbox?
Use washed, screened play sand that is labeled non-toxic and free of crystalline silica dust. Avoid ordinary construction or masonry sand, which can be dusty and sharp. This calculator sizes any dry play sand at about 100 lb per cubic foot; check your bag's weight if it differs.
Are these sandbox figures exact?
They are planning estimates. Sand settles and compacts, kids scoop some out, and bag weights vary, so buy a little extra rather than exactly the calculated amount. The tool rounds bags up to whole units, which usually covers normal spillage and topping up over a season.