The geoid calculation method by KTH was developed at the Royal Institute of Technology (KTH) in Stockholm and it is based on the modified version of Stoke's formula. The initial phase of experimental gravimetric geoid computations in the territory of Latvia by KTH method used digital free air anomaly data from the USSR era and the data from EGM2008 – global Earth's gravitational field model. Also the data from the gravimetric measurements of Latvian Geospatial information agency for the region of Riga were used and EGM2008 data as well as the data from GO_CONS_GCF_2_DIR_R4 – Earth's gravitational field model obtained by GOCE satellite. The mean square error for the geoid model in the region of Riga, obtained using this most recent data from gravimetric measurements and GO_CONS_GCF_2_DIR_R4, according to the GNSS/levelling data is equal to 7.5 cm.