ABSTRACT: To express the given data approximately, there are several possible equations of different types, which one can attains. The best fitted curve may be of different degree polynomial or any exponential curve. The curve fitting plays an vital role in the study of theoretical and practical aspects of daily life problems. In experimental work, we repeatedly met the problem of fitting a curve to data which are subjected to errors. In present paper applications has been explored with help of MATLAB for linearization of non-linear laws and linear, quadratic and cubic fit with residuals are represented graphically