River Rock Calculator (Tons)
Tonnage of decorative river rock by stone size — bigger stones need a deeper layer to hide the ground.
Lay landscape fabric first or the rock disappears into soil within two seasons. 1–2″ rock covers best per ton; 4″+ boulder mixes are accents, not coverage.
Formula
River Rock Calculator (Tons) is a free river rock calculator for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About River Rock Calculator (Tons)
Tonnage of decorative river rock by stone size — bigger stones need a deeper layer to hide the ground. The calculation implements V = area × depth; mass = V × ρ (river rock ≈ 1.6 t/m³ bulk) (Aggregate supplier coverage charts (~1.6 t/m³)). Lay landscape fabric first or the rock disappears into soil within two seasons. 1–2″ rock covers best per ton; 4″+ boulder mixes are accents, not coverage.
How to use River Rock Calculator (Tons)
- 1Enter Area in m².
- 2Enter Layer depth in mm (Rule: depth ≥ 2 × largest stone size).
- 3Enter Bulk density in t/m³.
- 4Read Tonnes, Cubic yards, 0.5 ft³ bags instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use River Rock Calculator (Tons)?
- ✓Implements the standard formula — V = area × depth; mass = V × ρ (river rock ≈ 1.6 t/m³ bulk)
- ✓Reference cited on-page: Aggregate supplier coverage charts (~1.6 t/m³)
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the River Rock Calculator (Tons) use?+
It computes V = area × depth; mass = V × ρ (river rock ≈ 1.6 t/m³ bulk), per Aggregate supplier coverage charts (~1.6 t/m³). The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Lay landscape fabric first or the rock disappears into soil within two seasons. 1–2″ rock covers best per ton; 4″+ boulder mixes are accents, not coverage.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the River Rock Calculator (Tons) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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