Sand Calculator
Calculate the volume, weight in tons, and 50lb bag count of sand needed for children's sandboxes, paver bedding, above-ground pool cushions, or masonry mix.
Calculation Results
Total volume in cubic yards for bulk ordering.
Total volume measured in cubic feet.
Total weight of sand in short tons (2,000 lbs).
Number of retail 50 lb bags (approx. 0.5 cubic feet each).
Estimated material cost based on retail 50 lb bag pricing.
How This Calculator Works
Calculate your sand requirements in seconds:
- Enter Surface Dimensions: Input length and width of the sandbox, patio, or pool excavation.
- Select Depth: Paver installations require exactly 1 inch of uncompacted coarse bedding sand. Children's sandboxes typically require 4 to 8 inches. Above-ground pool liners require 2 inches of smooth sand.
- Select Sand Type: Choose play sand for kids, coarse concrete sand for paver bedding, or fine sand for masonry mortar.
- Review Takeoff: Check cubic yards, total weight in tons, retail 50lb bag counts, and estimated cost.
Formula & Calculations
Sand volume and tonnage calculations convert area and layer thickness to cubic space, multiplied by bulk mineral density:
1. Volumetric Formula
Volume (cu ft) = Length (ft) × Width (ft) × Depth (ft)
Cubic Yards = Volume (cu ft) / 27
2. Weight Tonnage Formula
Bulk density varies depending on grain sizing and water content:
- Dry Play Sand: ~100 lbs/cu ft (1.35 tons per cubic yard).
- Coarse Concrete Sand (Paver Base): ~104 lbs/cu ft (1.40 tons per cubic yard).
- Wet Packed Mason Sand: ~111 lbs/cu ft (1.50 tons per cubic yard).
3. Bag Yields
A standard 50 lb retail bag yields approximately 0.50 cubic feet. It takes 54 bags of 50 lb sand to equal 1 cubic yard.
Step-by-Step Calculation Examples
Backyard Sandbox (8ft x 6ft x 6in depth)
Filling a play sandbox with clean washed play sand and 10% settling allowance.
- length: 8
- width: 6
- depth: 6
- sand_type: 100
- waste: 10
- cost_per_bag: 5.5
- volume: 0.98 cu yd
- volume_cuft: 26.4 cu ft
- weight: 1.32 ton
- bags_50lb: 53
- total_cost: $291.50
Frequently Asked Questions
How much sand do I need for a children's sandbox?
A typical 4ft x 4ft sandbox filled to a depth of 6 inches requires 8 cubic feet of play sand (approx. 16 bags of 50 lb sand). A larger 6ft x 6ft sandbox at 6 inches deep requires 18 cubic feet (36 bags of 50 lb sand).
How deep should sand be under patio pavers?
Industry standards (ICPI) strictly call for 1 inch (maximum 1.5 inches) of uncompacted coarse bedding sand (ASTM C33 concrete sand) screeded over a 4 to 6-inch compacted gravel base. Using too much sand causes pavers to shift, sink, and rut over time.
What kind of sand should be used for a sandbox?
Always use specially processed "Play Sand." Play sand is washed, dried, screened, and tumble-smoothed to remove crystalline silica dust, sharp fractured edges, and dirt contaminants, making it safe for children.
How much does a cubic yard of sand weigh?
A cubic yard of dry sand weighs approximately 2,700 pounds (1.35 tons). Wet or damp sand weighs approximately 3,000 to 3,200 pounds (1.5 to 1.6 tons).
How many 50 lb bags of sand are in a cubic yard?
It takes 54 bags of 50 lb sand to make one cubic yard (27 cubic feet / 0.5 cu ft per bag = 54 bags).
How much sand is needed under an above-ground swimming pool?
A 2-inch sand cushion is standard underneath above-ground pool vinyl liners to protect against punctures from rocks and roots. For a 15-foot round pool, you will need approximately 1.5 cubic yards (approx. 80 bags of 50 lb sand).