A program in visual basic software was developed for predicting tractor implement performance and energy mapping of tractor implement combination. A simple and complete instrumentation system for evaluation of tractor performance under actual field condition is discussed. The instrumentation system of tractor was tested under actual field condition for validation of the developed software, and found good results. The software was developed by considering various traction models, fuel consumption models and draft models to fit for most commonly used agricultural tractor implement combinations. The developed software is user friendly and efficient in predicting. This could help the researchers and engineers for power and energy mapping of new tractor and implement models.