Rainwater Harvesting Calculator

Calculate your rainwater harvesting potential and water savings using environmental science formulas

Roof Area (m²)(Collection surface)

Runoff Coefficient(0-1)

Annual Rainfall (mm)(Yearly average)

Collection Efficiency(0-1)

Tank Capacity (liters)(Storage volume)

Daily Water Demand (liters)(Daily usage)

Water Cost ($ per liter)(Local rate)

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Quick Tips

1Use current environmental data
2Consider seasonal variations
3Document calculation assumptions
4Update calculations periodically