A simple method for predicting fat-free weight (FFW) with a physical fitness test has been proposed. Fat weight and relative fat could be easily calculated with FFW. The prediction equations are based on a biomechanical model of the motion of the physical fitness test. The predictive variables are height, weight, and one of the three physical fitness tests: grip strength, back strength, and vertical jump. The parameters in the equations could be estimated using ordinary multiple regression analysis because FFW and the terms of predictive variables proved to be linear after arrangement. The assumptions, the simplifications in this theory, and other possibilities were discussed taking practicability into consideration.

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