Calculate Your RainwaterHarvesting Potential
Empower your home with sustainable water solutions! Discover how much rainwater you can collect and use with our personalized calculator designed specifically for Texas residents.
Join thousands of Texans making a positive impact on our environment
Why This Calculator is Different
Built on monthly rainfall through time mapped to a 4 km × 4 km grid at your location, this tool offers a more precise estimate of how much you can capture—plus a customizable tank simulation to see how your system would perform month‑by‑month over decades.
Local 4 km grid data
Uses historical monthly rainfall for a ~4 km × 4 km cell centered near your property.
More precise capture
Location‑specific rainfall improves collection estimates beyond generic calculators.
Custom tank simulation
See month‑by‑month tank levels and reliability over the historical record.
Get Started in 3 Simple Steps
Enter your home's details below to estimate how much rainwater you can collect and use.
Find Your Location
Enter your address or select your property on the map
Enter Property Details
Provide roof area and other basic information about your home
Get Your Results
View personalized estimates and system recommendations
Location
Find your property
Property Details
Enter home information
Results
View your analysis
Find Your Location
Enter your address or click on the map to select your property and get location-specific rainfall data.