Interval type-2 pentagonal fuzzy numbers are developed from the pentagonal fuzzy numbers and interval-valued pentagonal fuzzy numbers concepts. Previous researchers have suggested that various defuzzification methods were used to transform pentagonal fuzzy numbers into crisp numbers. However, very little research discusses defuzzification methods for interval type-2 pentagonal fuzzy numbers. Five interval-tuple fuzzy numbers that act as the input transformed information are needed to obtain crisp numbers via defuzzification methods. Therefore, this study examined some defuzzification methods for developing interval type-2 pentagonal fuzzy numbers where interval type-2 pentagonal fuzzy numbers (input) are transformed into crisp numbers (output). In addition, a comparison between interval type-2 pentagonal fuzzy numbers and general pentagonal fuzzy numbers are provided to validate the consistency and efficiency of these defuzzification methods.