River Rock Calculator
Estimate tons and cubic yards of river rock for beds, dry creek beds, and ground cover, with density adjusted for stone size.
Formula and figures last reviewed by the Cosyslabs team · how we verify
Inputs
Result
River rock needed
1.00 tons
Volume
0.78 yd³
- Weight
- 1995 lb
- Coverage
- 120 ft² at 2.0 in
- Density used
- 95 lb/ft³
- Waste
- 5%
Waste default: 5% — Five percent covers settling and the spread beyond the marked edge.
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
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Frequently asked questions
Multiply length by width by depth in feet, then by about 95 lb/ft³ and divide by 2,000 for tons. A 20 × 6 ft bed at 2 inches deep needs roughly 0.95 tons, or about two-thirds of a cubic yard.
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Cosyslabs. (2026). River Rock Calculator. Rough Estimator!. https://roughestimator.com/river-rock-calculator
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