The results of a numerical treatment of the dependence of half‐widths of electron energy distribution on temperature, field, and work function are presented for the electrons emitted from a metal at temperatures and fields within the extended field emission range. For the distribution, the width of the peak at half maximum and the partial widths from peak to half‐maximum on either side are presented graphically as a function of one parameter depending on temperature, field, and work function. The peak energy can also be determined in terms of this parameter.