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Paint Quantity Estimator
Estimate paint volume, cans and cost from walls, openings, coats and declared coverage.
Room length (m), Room width (m), Wall height (m), Total excluded openings (m²), Coats, Coverage (m²/L), Extra paint (%), Can size (L), Cost per can
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
Room length (m): 5
Room width (m): 4
Wall height (m): 2.5
Total excluded openings (m²): 5
Coats: 2
Coverage (m²/L): 10
Extra paint (%): 10
Can size (L): 2.5
Cost per can: 25
Limitations
- One rectangular room; wall area only, openings total area supplied. Net wall area cannot be negative. Coverage m²/L and can size L supplied; whole coats 1–20; overage 0–100%. No ceiling, porous-surface or brand-coverage prediction.
- 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.
- Whole purchasing/layout counts use exact entered decimal quantities for rational formulas; circular geometry remains floating-point.
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