Back to calculator
Construction & DIYGenerated accuracy model review: 2026-05-06
Fence Estimator 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
- The math assumes a standard straight run: 1. **Panels:** Total Length / Panel Width (Rounded up). 2. **Posts:** Panels + 1 (Assuming a post at the start and end of every section). 3. **Concrete:** 2 bags (50-60lb) per post is a standard rule of thumb for average soil conditions.
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Fence Length: 100 ft
- Panel Width: 8 ft
Expected outputs
- Panels Needed: 13
- Posts Needed: 14
- Concrete Bags: 28
Known limitations
- Assumes a straight run with evenly spaced panels. Does not account for closed loops, gates, corners, or corner bracing specifically.
Assumptions
- The estimate assumes a simple straight run using standard panels.
- Fence length and panel width must be positive measurements in feet.
- Concrete assumes about two 50-60 lb bags per post and does not account for gates or corner details.
Unit handling
- Fence Length accepts values in ft.
- Panel Width accepts values 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 fence-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Fence Estimator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.