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Gable Roof Area and Material Estimator
Estimate sloped gable roof area and whole coverage packs from horizontal dimensions and pitch.
Building length (m), Building span (m), Horizontal overhang on every edge (m), Pitch rise per 12 run, Extra coverage (%), Coverage per pack (m²), Cost per pack
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values and use the displayed units.
- Choose Calculate result and inspect the full report, assumptions and undefined/no-solution status.
- Choose Download result to save the complete JSON. Reset clears results and restores the example controls.
Examples
Building length (m): 10
Building span (m): 8
Horizontal overhang on every edge (m): 0.3
Pitch rise per 12 run: 6
Extra coverage (%): 10
Coverage per pack (m²): 3
Cost per pack: 30
Limitations
- Symmetric straight gable only; footprint length/span m, uniform horizontal overhang m, nonnegative rise per 12 run. Coverage per pack m² and extra percent supplied. No hips, dormers, flashing, fastening, loading or building-code assessment.
- Scalar numeric inputs use explicit decimal syntax and IEEE-754 arithmetic; unless a tighter bound is stated, positive values are 1e-12–1e12 and nonnegative values 0–1e12. Derived inventory counts above 1 billion and nonfinite results are refused. Combined input limit400,000 UTF-8 bytes;complete JSON output limit4MiB. Numeric/code input controls allow128 characters. All processing stays in your browser.
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