A software program, CurvFitXYZ, has been developed to curve fit data for algorithm definition. The program, designed for the personal computer (Microsoft Windows), determines the equation coefficients for functions y = f (x) and y = f (x,z). A unique curve fit procedure not only considers non-linear variation with x, but also with z, thus providing a more accurate algorithm definition of the data. The curve fit algorithm can be used in the development of software for scientific simulations or engineering control functions. Polynomial, exponential and power form of the equation may be used for the data curve fit. Linear regression is also a curve fit option, which may be used with the method of least squares to predict commodity futures; discussed later in the text. Data plotting is provided by the program PlotXYZ.