A computer algorithm was developed to calculate erosion risk on landscapes. The algorithm can be linked to GIS software and assigns values to different land units based on land use and soil data. The manual method underestimates erosion risk because it doesn't consider flow convergence. The computer algorithm provides more accurate results and can predict soil losses using a simple overlay procedure. The algorithm allows users to choose whether land units are hydrologically isolated or continuous. The predicted erosion risk matched well with observed soil truncation in the test area.