Today's online calculators and math applications, photo math applications and calculators contain only the knowledge already stated in the book such as the sine and cosine rule . As example, there are some incomplete and incorrect answers from Wolfram Alfa, Symbolab, and MathPortal as of July 7, 2022. This will cause students to reduce their interest in using today's technological tools and hinder the promotion of effective mathematics learning. Therefore, a new Technical Tool for solve this problem with complete design is needed today to help teach and learn in higher education, which is the main goal of the creation of PCET calculator. The PCET calculator design covers some future knowledge like Peter Chew rule that has not yet been covered in any textbook as of today. Peter Chew rule is created to solve the some math's problem mention directly as complement rule of topic solution of triangle. PCET calculator having special functionalities. Use future knowledge in PCET calculator design, such as Peter Chew Rule [[Chew, Peter, 2019]], Peter Chew Method [[Chew, Peter, 2019]] and Peter Chew Theorem [Chew, Peter, 2021]]. It enables the PCET calculator to solve some problems that currently cannot be solved by online calculators , math applications, photo math applications and calculators. Another goal of the PCET calculator is to help students to gain interests and promote effective learning in mathematics by mathematical game.