Rainwater Calculator
How much rain could your roof collect, and how far could that water go? Use local rainfall history to explore collection potential, tank sizing, and water supply through wet and dry months. Free to use.
New to rainwater harvesting? Learn the basics or explore the rainfall data.
1
Location
Find your property
2
Property Details
Enter home information
3
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.
Can't find your address? Use the map to select your location
Rainwater Site Planner
Measure your roof catchment on aerial imagery, arrange multiple tanks, and compare round, rectangular, and slimline footprints before planning an installation.
Additional tools include custom rainfall analysis for your own data and a firm-yield calculator.