Sand Calculator
Estimate sand volume from a rectangular area, a circle or a known volume. Add your supplier's density to calculate weight in tons, or use the selected product's bag volume or bag weight to estimate whole bags.
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How Much Sand Do I Need?
Calculate the space the sand will fill before converting it to weight or bags. Use inside dimensions for a box or container, and enter only the sand layer's depth. If you already have the square footage, choose Known area + depth.
| Measurements | Formula | Result |
|---|---|---|
| Length/width in ft, depth in in | L × W × depth ÷ 12 | ft³ |
| Area in ft², depth in in | Area × depth ÷ 324 | yd³ |
| Diameter in ft, depth in in | π × (diameter ÷ 2)² × depth ÷ 12 | ft³ |
| Length/width in m, depth in cm | L × W × depth ÷ 100 | m³ |
A 6 × 4 ft box filled 3 in deep needs 6 ft³ = 0.2222 yd³. In metric, a 2 × 1.5 m area filled 10 cm deep needs 0.3 m³. These dimensions illustrate the calculation; they do not prescribe a layer depth.
Circle or cylinder: use diameter, not radius
A 6 ft diameter circular area filled 4 in deep needs 9.4248 ft³ = 0.3491 yd³. The same formula works for an upright, straight-sided cylinder filled to a measured height. It does not model a cone-shaped pile or a partly filled horizontal drum. Add separate sections for different areas or depths.
Calculate Sand in Tons Using the Right Density
Sand volume does not uniquely determine its weight. Grain grading, packing and moisture all affect the bulk density. Ask the supplier for a weight per volume that matches the product and its loose or placed condition.
Weight (lb) = volume (ft³) × bulk density (lb/ft³)
US short tons = weight (lb) ÷ 2,000
Metric tonnes = weight (kg) ÷ 1,000
At a hypothetical 100 lb/ft³, 1 yd³ weighs 27 × 100 = 2,700 lb, or 1.35 US short tons. That number is an arithmetic example, not a universal sand density. The calculator leaves weight blank until you enter a density.
Wet sand is not a fixed multiplier
Moisture adds mass, but it can also change the space between grains: loose damp sand can bulk up. A fixed volume of wet sand is therefore not handled reliably by applying one blanket percentage to a dry-density value. Use matched product data instead of a dry/wet dropdown that silently assigns a new density.
Also distinguish bulk density, which includes spaces between grains, from solid-grain density. If your depth describes a compacted layer, confirm the supplier's loose ordering volume separately. The optional allowance adds a stated percentage; it does not calculate compaction or moisture bulking.
How Many Bags of Play Sand Do I Need?
Use the play sand calculator with the inside dimensions of the sandbox and the intended fill depth. Leave any planned space below the rim out of the sand depth. Choose a product intended for that use; the tool counts material rather than choosing a suitable product or play-surface specification.
In the 6 × 4 ft, 3 in example, the requirement is 6 ft³. If the selected bag provides 0.5 ft³, you need 12 bags. With an explicitly chosen 10% allowance, 6.6 ft³ requires 14 bags, containing 7 ft³. The 0.4 ft³ from whole-bag rounding is separate from the 0.6 ft³ allowance.
| Bag information | How the count is calculated |
|---|---|
| Volume, such as ft³ or liters | Total sand volume ÷ volume per bag, rounded up once |
| Weight, such as lb or kg | Volume × matching bulk density ÷ bag weight, rounded up once |
Sakrete's Natural Play Sand technical sheet uses a 0.5 ft³ bag-volume calculation. Check the current package you are buying; that does not establish the same yield for every 50 lb sand bag.
What if my bag only says 50 lb?
Select Label gives weight per bag and supply density for the same sand and condition. For example, 6 ft³ at a hypothetical 100 lb/ft³ gives 600 lb, or 12 bags of 50 lb. If you do not have matching density, request the product's volume coverage instead. Bag weight alone is insufficient.
All sections are combined before rounding, so reusable material is not purchased again for each section. Bulk order weight is shown before the extra material caused by whole-bag rounding; purchased bag weight or volume is shown separately.
Bedding Sand and Polymeric Joint Sand Are Different
A bedding layer fills a continuous space beneath pavers, so its quantity follows area × depth. Jointing sand fills the gaps between pieces. Treating those gaps as a full layer over the entire patio gives a different quantity.
A polymeric sand calculator needs the product's coverage data or the dimensions of the joints between pavers. This calculator measures continuous sand layers, so use the manufacturer's coverage guidance for polymeric joint sand. See the bedding sand vs polymeric sand diagram if you are unsure which layer you need.
For paver counts together with separate base and bedding quantities, use the paver calculator.
Sources & Methodology
Each section is converted to ft³, summed, then increased only by the entered allowance. Weight uses user-entered bulk density. Bags use either label volume or label weight with matching density, with one upward rounding after summation. No default sand density, bag size, moisture correction or compaction factor is applied.
1 ft = 0.3048 m; 1 yd³ = 27 ft³; 1 m³ = 1,000 L; 1 lb = 0.45359237 kg. Examples are illustrative. Method and linked product data reviewed October 23, 2026.
