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Construction & DIYGenerated accuracy model review: 2026-05-06
Gravel & Mulch accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- 1. **Volume (Cubic Feet)** = Length (ft) × Width (ft) × (Depth (in) / 12). 2. **Cubic Yards** = Cubic Feet / 27. 3. **Weight (Tons)** = Cubic Yards × Density Factor (e.g., Gravel is ~1.4 tons/yd, Mulch is ~0.3 tons/yd).
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Length: 20 ft
- Width: 10 ft
- Depth: 3 in
- Material: Gravel / Crushed Stone (1.4 ton/yd)
Expected outputs
- Cubic Yards: 1.85 yd³
- Est. Weight: 2.59 Tons
- 2ft³ Bags: 25
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- Length and width are measured in feet, while depth is measured in inches.
- All dimensions must be positive and the selected density preset is used as a planning estimate.
- Bag counts assume standard 2 cubic foot bags and do not include compaction losses.
Unit handling
- Length accepts values in ft.
- Width accepts values in ft.
- Depth accepts values in in.
- Material accepts one of the configured options.
- Cubic Yards is displayed in yd³.
- Est. Weight is displayed in Tons.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current gravel-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Gravel & Mulch.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.