The process of converting water from a liquid or a solid to a gaseous state and escaping into the atmosphere is called evaporation. The determination of water surface evaporation is very important in agricultural production and hydrological work. In areas where rainfall is scarce, groundwater sources and inflows of runoff are small, such as evaporation, it is prone to drought. Our application is to help users calculate the evaporation of the current ambient water by adding the necessary values. -Simple interface, functional and practical. - Easy to operate and easy to use.