Rainfall Calculator
Calculate rainfall volume, water collection potential, and runoff estimates for any area. Perfect for gardeners, farmers, rainwater harvesting, and irrigation planning.
Step 1: Area Specifications
Understanding Rainfall Collection
Collection efficiency accounts for losses due to evaporation, runoff, and surface absorption. Roof collection typically has 85-95% efficiency, while ground collection may be 50-75% efficient.
Step 2: Calculation Parameters
Rainfall Volume Formula
Volume (liters) = Area (m²) × Rainfall (mm) × Collection Efficiency. 1 mm of rain on 1 m² = 1 liter of water. This calculator helps estimate water harvesting potential for sustainable water management.
Rainfall Calculation Results
Collected Rainfall Volume
Monthly Rainfall Collection Comparison
| Month | Avg. Rainfall | Collected Volume | Equivalent Showers |
|---|
Rainfall Collection Breakdown
Rainfall Volume Formula
Volume (liters) = Area (m²) × Rainfall (mm) × Collection Efficiency (%)
To calculate collected rainwater: Multiply area in square meters by rainfall in millimeters, then multiply by collection efficiency percentage (as a decimal). 1 mm of rain on 1 m² equals 1 liter of water.
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