An accurate calibration of the energy measurement of electrons and photons is needed for many ATLAS physics analyses. The calibration of the energy measurement is performed in-situ using a large statistics of $Z\to e^{-}e^{+}$ events. A pre-requisite of this calibration is a good understanding of the material in front of the calorimeter and of the inter-calibration of the different calorimeter layers. The $Z\to e^{-}e^{+}$ sample is also used to measure the energy resolution. The results obtained with proton-proton collision data at $\sqrt{s}=13\,\mathrm{TeV}$ in 2015-2017 corresponding to an integrated luminosity of $80\,\mathrm{fb}^{-1}$ are presented as well as the corresponding uncertainties on the electron and photon energy scales.