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Abstract: This paper presents a velocity prediction program (VPP) respectively a power prediction program (PPP) for ships driven or assisted by wind propulsion systems named ”E4-SAIL”. The program balances the forces acting on the ship in the four degrees of freedom (4DOF) surge, sway, roll and yaw. Therefore, environmental forces caused by wind, current and seastate can be considered. The VPP/PPP is embedded within the design environment ”E4”, so the pediction can be refined directly within the design process whenever more information on the ship is known. Thanks to the integration into the design environment, the calculation of the transversal forces acting on the hull and the forces due to the seastate takes into account the shape of the hull instead of using only an amount of ship parameters. Because the VPP/PPP is intended for use in the early design stage, the calculations have to run very fast, so that the effect of several changes in hullform and floating position can easily be checked during the design process. The individual force components are presented and an exemplary calculation for a tall ship is shown.