This app has been developed based on the scientific considerations to calculate the Motor/Engine Pulley size and total length of belt required for proper operation of centrigugal pump.The app provides a simple and practical method with no specific need for technical skill. The user need to know only the size of pump pully, spped of pump and speed of motor/Engine.This will help the farmers to know the exact length of belt required to operate the pump. The app has been developed by Dr A K Jain, former Professor of Soil and Water Engineering - Punjab Agricultural University (India).