In this work, we propose an extremely simple, one-parameter, linear correction method that assumes DFT energies are indeed subject to proportional error. We call it the 110% PBE correction method because it multiplies energies given by DFT with the widely used Perdew-Burke-Ernzerhof (PBE) exchangecorrelation functional by a factor of about 1.1. The functional form is shown below in equation 6.