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Sandbox Sand Calculator

Calculate safe, non-toxic washed play sand bags (50 lb) for square, rectangular, octagonal, and circular sandboxes.

Play Sand Requirements

Real-Time
Play Sand Bags Required
0 Bags
Rounded up for optimal fill
Total Weight
0 lbs
~100 lbs/cft
Volume (CFT)
0.00 CFT
Cubic feet
Estimated Cost
$0.00
At ~$6/bag play sand
Visual Engineering

Children's Sandbox Volume & Bags

Timber frame sandbox layout with non-toxic, washed play sand bag calculations.

WASHED PLAY SAND (50 LB BAGS) SANDBOX MATH • Vol (CFT) = L(ft) × W(ft) × D(ft) • Play Sand Density ≈ 100 lbs/CFT • 50lb Bags = Total CFT × 2 Bags • Recommended depth: 4" to 6"

Children's Sandbox Volume & Bags

Timber frame sandbox layout with non-toxic, washed play sand bag calculations.

Mathematical Theory

Engineering Calculations & Formulas

Mathematical formulas and engineering constants powering this calculator.

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Sandbox 50 lb Bags

Calculates pre-packaged bags based on standard 100 lbs per cubic foot play sand.

50lb Bags = ⌈ (Volume CFT × 100 lbs/CFT) / 50 ⌉ = CFT × 2
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Rectangular Sandbox Volume

Computes sandbox cubic feet from length, width, and sand fill depth.

CFT = Length (ft) × Width (ft) × (Depth (in) / 12)
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Hexagonal / Round Sandbox

Volume formula for round or polygonal sandbox kits.

Volume = π × Radius² × Depth