This research is part of the T-BERS (Taiwan Building Energy Efficiency Rating System) plan of ABRI(Architecture and Building Research Institute) and focuses on developing an energy prediction method as well as an energy-efficiency rating system for existing hotel buildings based on energy bills. T-BERS introduced the “Dynamic Zone EUI(energy use intensity)” method and EUI right skewed distribution as its methodology which applied 7 steps scaling from EN’s public building labelling system “EP Label”. Its rating EUI population model was established by eQUEST simulation using benchmarking building models as the US DOE’s BEAS system. Its 7 step scaling of EUI right skewed distribution was established based on a median EUI, set by the qualified level of existing building energy regulation, and a minimum EUI and a maximum EUI, set by the best level to worst level in building envelope performance, lighting and AC system performance. This rating model was calibrated using the measured EUI population distribution of hotels from the Bureau of Energy and was confirmed to catch the real characteristic of marketing EUI distribution. The T-BERS meets the requirements of scale sensitivity and scale credibility. This research also proposes a modified method of energy bills by using deterioration factor and guest room occupancy rate to calibrate the atypically operated hotel to get customized, fairer, and more reasonable rating results. The rating system is supposed to combine the existing Green Building Labelling system to execute T-BERS and expected to become a voluntary or incentive energy management policy for the private hotel sector in the future.