The LAB Fit is a software for Windows developed for treatment and analysis of experimental data. You can create data file, by manually inputting your data or paste data from Excel files. You can also import data from a non formatted TXT file. Output graphs can be zoomed into in order to provide high printing quality. The LAB Fit has a menu for curve fitting and the main programs of this menu use nonlinear regression. The LAB Fit fits functions of one and several independent variables (from 1 up to 6), admitting uncertainties at the dependent variable (Y) and also at the independent variables (X). In case of uncertainties in X and in Y it’s made a pre-fit not considering the uncertainties in X, that later on are transferred to Y by error propagation. At the LAB Fit library there are more than 200 functions with one independent variable and almost 280 functions with two independent variables. The user disposes of a functions finder program. If necessary, there is an option so that the user can write its own fit function. Once determined the fit parameters, it’s possible to extrapolate the fit function and, for the 2D and 3D cases, the graph of the obtained function is shown. For the 2D case, beyond the extrapolation possibility, the user can even include error bars and confidence bands to the graph. The LAB Fit has also a menu destined to the treatment of similar data, non-similar data and error propagation. Beyond that, there is a third menu with general tools like to plot a function informed by user and many other types of calculations. 
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