The aim of this study is to estimate the green, blue and grey water footprint of crops and crop products in a spatiallyexplicit way. We quantify the green, blue and grey water footprint of crop production by using a grid-based dynamic water balance model that takes into account local climate and soil conditions and nitrogen fertilizer application rates and calculates the crop water requirements, actual crop water use and yields and finally the green, blue and grey water footprint at grid level. The model has been applied at a spatial resolution of 5 by 5 arc minute. The model’s conceptual framework is based on the CROPWAT approach (Allen et al., 1998).