Rainwater Capture
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Rainwater Capture
Estimate collected rainwater from a measured rainfall event.
UNDERSTAND YOUR RESULT
How it works
Estimate collected rainwater from a measured rainfall event.
THE CALCULATIONlitres = area × rainfall depth × collection fraction
Using this calculator
Enter catchment area (m²), rain depth (mm), collection efficiency (%). litres = area × rainfall depth × collection fraction.
What to keep in mind
A quantity estimate using your measurements, not a structural design, building-code check or purchasing specification. Allow for real shapes, cutting and the product instructions.
Frequently asked questions
Are my entries saved?
No. Calculator inputs remain in the current page and are cleared when you reload or leave. The tools do not upload your entries.
Why are results rounded?
The display is rounded for readability. Calculations use unrounded intermediate values. An estimate should not be interpreted as an exact measurement.