Rainwater harvest Calculator

Rainwater harvesting is the gathering, or accumulating and storing, of rainwater for small irrigation and a way to increase ground water levels.

Calculate rainfall harvesting online by entering the roof area, and the amount of rainfall.

Rainwater harvest Calculator

  • Enter the Roof area : (m2) :

  • Amount of rainfall : (mm) :

  • Cloudbase (Foot):


Rainfall harvest = ( RA * AF * 0.9 )

RA - Roof Area
AF - Amount of Rainfall
0.9 - Amount of total rainwater expected for harvesting.

This online calcualtor helps you dynamically to calculate the rainwater harvest from the amount of rainfall.