Is this Rainfall Calculator free to use?

Yes, Rainfall Calculator is 100% free to use online with no installation or account required.

How do I use the Rainfall Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

Rainfall Calculator — Free Online Tool

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Calculate rainwater collection volume and runoff based on depth and area

Instructions: Enter rainfall depth and catchment area (roof or ground surface) below.

Rainfall & Catchment Parameters

Rainfall Depth (inches)

Catchment Area (sq. ft)

⚠️ For water harvesting, drainage planning, and reference purposes only.

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