Pre-harvest Grain Crop Yield Estimator. This application has been designed to provide the Farmer, Contractor, Agronomist or Crop Insurer with a pre-harvest estimate of the crops yield and the paddocks total volume. This application is very simple to use, provides a good estimate of a grain crops yield weeks before the harvester enters the paddock. This application has been designed to solve an age old problem and it does it well. Anyone can use this application.