To improve fire tube boiler combustion efficiency, several software options are available, including FireCAD, which offers both desktop and web applications for calculations related to combustion efficiency and gas properties. Users can access FireCAD online from any PC, making it convenient for studies and calculations. The discussion also briefly touches on the size of rack and pinion used in Formula SAE racing cars, though this is not the main focus. FireCAD is highlighted as a comprehensive tool for the necessary calculations. Utilizing such software can significantly aid in achieving better combustion efficiency in fire tube boilers.