Recent physiological studies on nutrition and growth have shown that leaf area is a reliable index of growth factor determining carbohydrate metabolism, yield and quality of crops. Software was developed using image processing toolbox of MATLAB, for calculating parameters of multiple leaves like area, length, width etc. Sample of 50 leaves of various shapes and sizes were used in measurements and results were compared with existing graphical method like grid counting. But grid counting method is very time consuming. So a user friendly Graphical User Interface (GUI) was developed in MATLAB. The leaf area meter developed system is low in cost, easy in operation, high accuracy & portable.