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Rainwater Harvesting Calculator
Calculate rainwater collection potential, storage requirements, and cost savings for your farm.
Catchment & Rainfall Details
Catchment Area Type
Roof / Building (Best - 95% efficiency)
Concrete Surface (85% efficiency)
Metal / Corrugated Sheet (90% efficiency)
Ground / Soil (Poor - 50% efficiency)
Catchment Area (square feet)
Roof area = length × width of building
Average Annual Rainfall (inches)
Pakistan average: 10-60 inches depending on region
Collection Efficiency (%)
Number of Rainy Days per Year
Current Water Cost (PKR per 1000 gallons)
Based on municipal or tanker water rates
Calculate Harvesting Potential
Reset
Water Harvesting Results
Annual Harvestable Water
0 gallons
Storage Tank Size Needed
0 gallons
Water per Rainy Day
0 gallons/day
Annual Cost Savings
PKR 0 / year
ROI Period (Tank ~PKR 50,000)
0 years
Quick Tip:
Enter your roof or catchment area size and local rainfall data to calculate harvestable rainwater and potential savings.
