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How much sand do I need?

Measure the area, multiply by the depth in feet, and convert to weight — sand is sold by the ton in bulk and by the 50-pound bag at retail, so volume alone will not let you order. Most sand runs about 100 pounds per cubic foot, or roughly 1.35 tons per cubic yard. Depth is where the job type matters more than the arithmetic. Paver bedding is exactly one inch, screeded flat and never compacted before the pavers go down; a thicker bed is the classic cause of a patio rutting, because sand does not compact the way base rock does. A sandbox wants six to twelve inches. Mortar sand is measured against the number of masonry units rather than an area at all. Sand type is not interchangeable. Bedding under pavers needs coarse concrete sand meeting ASTM C33 — play sand and mason sand are too fine, hold water, and let the units shift. Past about ten bags, bulk delivery is cheaper than bagged even after the delivery fee.

Worked example

A 20 × 10 ft paver patio with a 1-inch bedding layer

  1. 1Convert depth: 1 in ÷ 12 = 0.083 ft
  2. 2Volume: 20 × 10 × 0.083 = 16.7 ft³
  3. 3Weight at 105 lb/ft³ for concrete sand: 16.7 × 105 = 1,750 lb
  4. 4Tons: 1,750 ÷ 2,000 = 0.88 tons

Order 1 ton of concrete sand, or 35 fifty-pound bags.

Run your own numbers below — the Sand Calculator handles the unit conversions and waste factor for you.

Sand Calculator

Estimate tons, cubic yards, and 50-lb bags of sand for paver bedding, a sandbox, mortar, or fill — with density set by the type of sand you are buying.

Formula and figures last reviewed Cosyslabs · how we verify

Inputs

Result

Sand needed
0.92 tons
Volume
0.65 yd³
50-lb bags
37
Weight
1838 lb
Density used
105 lb/ft³
Waste
5%

Waste default: 5% — Five percent covers screeding losses and the material that stays in the truck bed or bag.

Diagram

LengthWidthDepth

Estimates only. Verify with a licensed contractor or supplier before purchasing. Rough Estimator! is not responsible for shortages, overages, or material variances. See our methodology for formulas and sources.

Formula

Volume ft³ = L × W × (D in ÷ 12) × (1 + waste)   ·   Tons = ft³ × density ÷ 2000

References

  1. ASTM C33 — Standard Specification for Concrete Aggregates
  2. Interlocking Concrete Pavement Institute — Bedding sand guidance

Related tools & materials

Don't forget

  • Crushed base rock
  • Polymeric joint sand
  • Landscape fabric
  • Edge restraint
  • Screed rails

Frequently asked questions

Multiply length by width by depth in feet to get cubic feet, then multiply by about 100 lb/ft³ and divide by 2,000 for tons. A 20 × 10 ft area at 1 inch deep is 16.7 cubic feet — roughly 0.85 tons, or about 34 fifty-pound bags.
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Cosyslabs. (2026). Sand Calculator. Rough Estimator!. https://roughestimator.com/sand-calculator

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