In the report the method of calculation of a flicker doze value is considered. Flicker doze characterizes intensity of voltage oscillations in power networks. This method is based on the use of standard flickermeter transfer function and obtained parameters of voltage fluctuation correlation functions. The results of calculations allow to compare expected values of voltage fluctuations in power networks to requests of the standards. In some cases in power networks it is possible to allow voltage fluctuation values, which exceed requests of the standards. The calculation of voltage fluctuation values in these cases is expedient for realizing in parallel with calculations of results of their negative effect degrees on a electric power equipment because of same correlation functions of voltage fluctuations in power supply networks.