Our online Rainfall Calculator is free for anyone to use. It’s environmentally friendly to capture water from the sky, as it requires less energy to process than building dams and aqueducts for a thirsty population. However, people are beginning to harvest rainwater in developed countries, such as in Europe and North America. Rainwater harvesting is more prevalent in developing nations, which often lack sufficient infrastructure to collect, sanitize and distribute water to the local citizens. People have been harvesting rainwater as a means to ensure a reliable supply of water for their drinking needs, as well as for irrigation, cleaning and other vital tasks. Based on the calculator’s results, you may determine that you can get by with a smaller system, or find out that you need to make it much larger to support your water harvesting needs. Our calculator is also a good tool to use when you are still planning to build your rainwater catchment system. Use our Rainfall Calculator to quickly determine how much rain has fallen in your location! Knowing how much rain has fallen into your rainwater catchment system is useful when you are projecting your water harvesting capabilities.

Precipitation meter