Rain Barrel & Roof Catchment Water Calculator
Calculate annual rainwater harvesting potential in gallons and cubic meters from roof area, precipitation depth, and runoff efficiency.
- 100% free
- Private in browser
- No signup
- No watermarks
Total Annual Yield (Gallons)
33,390
Yield per 1-Inch Storm (Gallons)
954
Barrels Filled per 1-Inch Storm
17.3
Total Harvest (Cubic Meters m³)
126.4
Rate this tool
Be the first to rate — helps others and improves this page.
About Rain Barrel & Roof Catchment Water Calculator
Calculate annual rainwater harvesting potential in gallons and cubic meters from roof area, precipitation depth, and runoff efficiency.
How to use Rain Barrel & Roof Catchment Water Calculator
- Enter your required input values into the fields.
- View the automatically calculated results in real time.
Key features
- Instant client-side calculation
- Real-time updates without page reloads
- Private and secure: zero data leaves your browser
Frequently asked questions
- Is this calculation free and private?
- Yes, 100% of calculations execute locally in your web browser. No inputs or personal data are stored or transmitted.