Using the calculator
Enter the values requested above. Estimate roof runoff capture and storage needed for a rainfall event.
FREE CALCULATOR · NO SIGN IN REQUIRED
Rain Barrel Calculator
Estimate roof runoff capture and storage needed for a rainfall event.
Enter your garden or yard measurements
Measure the actual area, depth, spacing, quantity, or product coverage that applies to the project. The rain barrel tool converts those inputs into practical planning quantities.
Important: Use the inputs that match your situation. Results are estimates based on the values and assumptions entered.
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How to use this calculator
Reading the result
The result shows roof runoff capture and storage needed for a rainfall event.
Results are estimates based on the values entered. Review the Methodology and Calculator Disclaimer for important limitations.