Analyzing thoroughly K and L X-ray transition energies, results of the former L-shell photoabsorption study and M subshell binding energies from photoelectron and optical spectroscopy, we determined the following electron binding energies in gaseous krypton: 14 327.26(4) eV for the K-shell and 1 921.4(3), 1 731.91(3) and 1 679.21(3) eV for L1-, L2-, and L3-subshells, respectively. These accurate values of electron binding energies are important for energy calibration of the next generation tritium β-decay experiment KATRIN with sub-eV sensitivity for the electron-neutrino mass.