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Construction & DIYGenerated accuracy model review: 2026-05-06
Decking Boards 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. **Effective Width** = Board Width + Gap Size. 2. **Linear Feet** = (Deck Area × 12) / Effective Width. 3. Adds a 10% waste factor for cuts and defects.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Deck Area: 200 ft²
- Board Width (Actual): 5.5 in
- Gap Size: 0.13 in
Expected outputs
- Linear Feet: 470 ft
- 12ft Boards: 40
- 16ft Boards: 30
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
- Deck area is already measured in square feet and represents the finished surface.
- Board width must be positive, and gap size can be zero or greater in inches.
- The estimate includes a built-in 10% waste allowance for cuts and defects.
Unit handling
- Deck Area accepts values in ft².
- Board Width (Actual) accepts values in in.
- Gap Size accepts values in in.
- Linear Feet is displayed in ft.
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 decking-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Decking Boards.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.