Rain Harvest 4+

RealSimple Software

Designed for iPad

    • 4.0 • 1 Rating
    • Free



Have you ever wondered how much rain falls on your roof during a typical rain storm? Use this simple rain harvesting calculator to find out. You will be amazed at how much water can be collected from your roof (or any other surface) during even the shortest of rain storms. Why not collect and store this wonderful natural resource and put it to good use later to water your organic garden?

A simple calculator interface allows for the input of:

Catchment surface area in square feet or square meters
Rainfall in inches or millimeters
Surface efficiency as a percentage
Number of collection points

The final result is then presented in total gallons or liters of collected runoff. Gallons or liters per collection point is also calculated when more than one collection point is entered into the calculator.

Happy Rain Harvesting!

What’s New

Version 5.0

Updated for iOS 13

Ratings and Reviews

4.0 out of 5
1 Rating

1 Rating

Jus409 ,

Great for contractors

Easy to use for quick information on potential system size and design.

Drewie82 ,

As promised

Does exactly what it says it does. Simple & effective.

granner ,

Fast & Simplistic

This is a great app for giving you an idea for collecting rainwater!

App Privacy

The developer, RealSimple Software, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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