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Various life estimation techniques for boiler tubes, usually use the assumed temperature. The result of life estimation for boiler tubes has some deviation from real temperature of it in case of previous estimation techniques. The purpose of this thesis is to provide a validated procedure for predict ing the remaining useful life of SA213-T22 typed superheater and reheater tubes. The algorithm of life estimation for boiler tubes suggested on this thesis, is based on steamside oxide scale and tube geometry. The temperature and life consumption of superheater and reheater tubes can be identified by applying the algorithm. The result of tube temperature by algorithm has good agreement with real value within 2% error. It is expected to improve the reliability of the life estimation techniques for boiler tubes and the availability of boiler equipment in power plants.