Relative permeabilities of water and steam were calculated, by applying the Shinohara method, using data from geothermal wells in Iceland. This method does not require that the local water saturation of the two phase mixture is known, but requires production history of mass flow and enthalpy from each well. The results were compared to relative permeability curves found in literature and to values from laboratory measurements and revealed that wells within the same field can follow different relative permeability curves. This method enabled us to get relative permeability values for geothermal wells with production history. (C) 2014 Elsevier Ltd. All rights reserved.