Rain Barrel Calculator
Calculate rainwater collection potential from your roof. See water bill savings and barrels needed.
Annual Collection Potential
37,380 gal
From 1,500 sq ft roof with 40" rain
Monthly Average
3,115 gal
Barrels Filled / Year
680
Barrels Recommended
57
Annual Water Savings
$186.90
Environmental Impact
| Water Conserved | 37,380 gal/year |
| Est. CO₂ Reduction | 75 lbs/year |
| Stormwater Runoff Reduced | 31,773 gal/year |
Actual collection varies with rainfall patterns, roof material, and gutter efficiency (assumes ~90% capture). Check local regulations — some areas restrict rainwater collection. Rain barrel water is not potable without treatment.
Use the Rain Barrel Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.
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