Inputs
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in
Presets are approximate. Adjust to your supplier specifications.
| # | Shape | Length / Dia | Width | Custom Area | Override Thickness | Map | Remove |
|---|---|---|---|---|---|---|---|
| Length unit: ft. Thickness unit: in. Custom area expects square length unit (ft² or m²). Maps average thickness values per row. | |||||||
Project Presets
Example Data Table
| # | Shape | Length/Dia | Width | Custom Area | Override Thickness |
|---|---|---|---|---|---|
| 1 | Rectangle | 25 | 12 | — | 2 |
| 2 | Rectangle | 10 | 8 | — | — |
| 3 | Circle | 6 | — | — | 1.5 |
| 4 | Custom | — | — | 100 | — |
Numbers use the current unit selection (ft / m, in / cm). Use “Load example rows” to populate inputs quickly.
Results
—Total Plan Area: —
Adjusted Area (slope): —
Volume: —
Density: —
Tons Required: —
Coverage per Ton @ thickness: —
Estimated Cost: —
Estimates only. Verify against supplier bulk density, gradation, and field conditions.
Packaging Breakdown
Common: 0.5 ft³, 0.75 ft³, 1.0 ft³, 20 L, 25 L, 30 L
Common: 40 lb, 50 lb, 20 kg, 25 kg
Common: 1.0 ton, 0.75 ton, 0.50 ton super sacks
Effective capacity obeys both bag count and max weight.
Volume Bags: —
Rounding extra: —
Pallets: — • leftover bags: —
Weight Bags: —
Rounding extra: —
Pallets: — • leftover bags: —
Bulk Sacks: —
Rounding extra: —
Pallets: — • leftover sacks: —
Auto-Pack Recommendation
—Chooses the plan with the **fewest pallets**. If equal, honors the preference toggle.
Formula Used
- Area (rectangle) = length × width
- Area (circle) = π × (diameter ÷ 2)²
- Thickness (ft) = thickness × (in→ft)
- Adjusted Area = Area × √(1 + slope²) with slope as rise/run
- Volume (ft³) = Σ Adjusted Area × Thickness
- Density (ton/ft³) from unit:
- lb/ft³ ÷ 2000
- kg/m³ × 0.06242796 ÷ 2000
- ton/yd³ ÷ 27
- Base Tons = Volume × Density
- Final Tons = Base Tons × (1 + waste%) × (1 + compaction%) × (1 + moisture%)
- Coverage per Ton = (1 ÷ Density) ÷ Thickness
- Per-area thickness maps: area-weighted average of cell values replaces row override.
- Pallet effective capacity = min(bags-per-pallet, floor(max-pallet-weight ÷ bag-weight)).
How to Use
- Choose mode: coverage → tons, tons → coverage, or both.
- Select units, enter global thickness, or set per-row overrides or maps.
- Pick a material preset or type a supplier density value.
- Add areas: rectangles, circles, or custom square units. Set slope if needed.
- Apply overage, compaction, and moisture adjustments as appropriate.
- Click Calculate to see tons, coverage per ton, and cost.
- Use Packaging Breakdown to translate tonnage into bags, sacks, and pallets.
- Export results as CSV or PDF, or save a named project preset.
FAQs
Use your supplier’s bulk density for the specific gradation. Presets are approximate. If unsure, measure a delivered volume and weight to back-calculate.
Rounded river rock compacts less than angular aggregate. Keep compaction near zero unless project specifications demand a particular placement factor.
Voids are represented here by overage or compaction factors. Higher voids typically require extra material to achieve a uniform visual thickness.
Decorative beds often range 1–3 inches depending on stone size and desired coverage. Heavier traffic or larger stones may need more depth.
Sloped surfaces have more actual surface area than their plan view. The √(1+slope²) factor accounts for that additional area.
Yes. Save multiple presets with distinct names. They are stored in your browser and can be loaded or deleted anytime.