An RPE (Rate of Perceived Exertion) calculator is a tool that helps individuals gauge the intensity of their workouts based on their perceived effort. It typically involves a numerical scale, such as 1 to 10, where users rate how hard they feel they are exerting themselves during exercise. The calculator then provides a quantifiable measure of intensity, allowing users to track their progress, make informed training decisions, and tailor their workouts to their desired level of exertion. With an RPE calculator, individuals can optimize their fitness routines and achieve their fitness goals more effectively.