How this calculator works
Area × depth gives the volume. Sand sold in bulk is priced by the ton, so the volume is multiplied by density; the bag count divides that weight by 50 lb.
Cubic yards = Length × Width × Depth(in)/12 × (1 + Waste%/100) ÷ 27
Tons = Cubic yards × Density
50 lb bags = round up( Tons × 2000 ÷ 50 )
Worked example
Using the default values in the calculator above:
| Input | Value |
|---|---|
| Length | 10 ft |
| Width | 10 ft |
| Depth | 2 in |
| Sand density | 1.35 tons/yd³ |
| Waste allowance | 5 % |
| Result | Value |
|---|---|
| Sand needed | 0.65 cubic yards |
| Weight | 0.88 tons |
| 50 lb bags | 35 bags |
| Volume | 17.5 cubic feet |
Step by step:
- Volume = 17.5 cu ft = 0.648 yd³
- Tons = 0.648 × 1.35 = 0.88
- 50 lb bags = 1,750 lb ÷ 50 → 35
Sand for common jobs
| Job | Sand needed | Weight | 50 lb bags |
|---|---|---|---|
| Paver bedding 10 × 10 ft, 1 in | 0.32 cubic yards | 0.44 tons | 18 bags |
| Sandbox 6 × 6 ft, 8 in | 0.89 cubic yards | 1.2 tons | 48 bags |
| Leveling 20 × 20 ft, 2 in | 2.59 cubic yards | 3.5 tons | 140 bags |
Common mistakes to avoid
- Using play sand as a paver base or concrete sand in a sandbox — the grades differ.
Frequently asked questions
How much sand for a sandbox?
A 6 × 6 ft box filled 8 in deep holds 24 cu ft — about 0.9 cubic yards, or roughly 48 bags of 50 lb play sand at 1.35 tons per yard.
How deep should bedding sand be under pavers?
About 1 in of screeded bedding sand is typical; follow the paver maker’s guide.