Bike Calculator Pro is an engineering model used to predict bicycle performance. You and your bike are a machine subject to external forces that you - the engine - must overcome in order to move. Bike Calculator Pro estimates how fast you'll go and how much energy you'll use. This Pro version of Bike Calculator was developed in association with www.bikecalculator.com and incorporates many enhancements including a new segments view and new energy output options for eBikes and kilojoules.