Energy audit is an essential part for developing energy saving devices. Presently energy is limited and substitutes are not sufficient. In the present study computerized model developed for the quick and efficient energy auditing with the help of C-language programme, it also suggest some alternate devices suitable for the case. It presents a mathematical model, which provides a simple but useful method of assessing the efficiency of motors under actual working conditions, and also outlines a procedure for estimating power saving by replacement of under loaded motors with smaller Kw motors.