# Sandbox Calculator

Calculate exactly how much sand you need for your sandbox. Get cubic feet, number of bags, total weight, and estimated cost for rectangular or circular.

## What this calculates

Building a sandbox for the kids? This calculator tells you exactly how much sand to buy. Enter your sandbox dimensions and desired depth to get the volume in cubic feet and yards, number of 50-lb bags, total weight, and estimated cost.

## Inputs

- **Sandbox Shape** — options: Rectangular, Circular
- **Length / Diameter** (feet) — min 1, max 30 — Length for rectangular, or diameter for circular.
- **Width** (feet) — min 1, max 30 — Width for rectangular sandboxes (ignored for circular).
- **Sand Depth** (inches) — min 1, max 24 — Recommended: 6-12 inches (15-30 cm) for good play depth.

## Outputs

- **Sand Volume** (cu ft) — Total sand volume needed.
- **Cubic Yards** (cu yd) — For bulk delivery orders (imperial reference).
- **Bags Needed** ((50-lb bags)) — Number of standard 50-lb play-sand bags.
- **Total Weight** (lb) — Total weight of sand needed.
- **Estimated Cost** — formatted as currency — Approximate cost based on bagged play sand (~$5 per 50-lb bag).

## Details

The amount of sand needed depends on the shape and depth of your sandbox:

  - Rectangular: Volume = Length x Width x Depth

  - Circular: Volume = Pi x (Diameter/2)^2 x Depth

Play sand weighs approximately 100 pounds per cubic foot. A standard 50-lb bag of play sand contains about 0.5 cubic feet. For a typical 6x6 foot sandbox filled to 6 inches deep, you will need about 18 cubic feet of sand, which equals roughly 36 bags weighing a total of 1,800 pounds.

For sandboxes requiring more than 1 cubic yard (27 cubic feet), consider buying sand in bulk from a landscape supply company rather than in bags. Bulk delivery is typically $25-$50 per cubic yard plus a delivery fee, which is much cheaper than bagged sand at scale. Always use play sand (washed, screened, non-toxic) rather than construction sand, which may contain dust, debris, or harmful materials.

## Frequently Asked Questions

**Q: How deep should sandbox sand be?**

A: A minimum of 6 inches is recommended for a good play experience. 8-12 inches is ideal and allows for digging without hitting the bottom. Avoid going over 12 inches, as the extra sand rarely gets used and significantly increases cost and weight.

**Q: What type of sand should I use?**

A: Always use play sand, which is washed and screened to remove dust, debris, and sharp particles. Look for non-toxic, ASTM-tested play sand from hardware stores. Do not use construction sand, beach sand, or masonry sand, as they may contain contaminants.

**Q: Should I buy bagged sand or bulk delivery?**

A: For small sandboxes (under 1 cubic yard / 27 bags), buying bags is convenient. For larger sandboxes, bulk delivery from a landscape supplier is significantly cheaper, typically $25-50 per cubic yard versus $5 per 50-lb bag ($270 per cubic yard). Bulk delivery requires truck access to your yard.

**Q: How often should sandbox sand be replaced?**

A: Replace sandbox sand every 1-2 years, or sooner if it becomes contaminated. Keep the sandbox covered when not in use to keep out animals and debris. Rake the sand regularly to help it dry and reduce bacteria. A sand cover or tarp is essential for maintaining clean play sand.

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Source: https://vastcalc.com/calculators/everyday/sandbox
Category: Everyday Life
Last updated: 2026-04-21