Patent ID: 8475300

Claim:
A method of evaluating a golf club comprising the steps of: a step (St 1 ) of using at least one computer for determining motions of the golf club during a swinging motion of a golf player including a period ranging from a time (Ts) to a time (Tf); a step (St 2 ) of using the at least one computer for obtaining power index values (Pw) in a time series during the period ranging from the time (Ts) to the time (Tf), based on the result of the determination; a step (St 3 ) of using the at least one computer for obtaining a power integration value (Sp) by integrating the power index values (Pw) during the period ranging from the time (Ts) to the time (Tf); a step (St 4 ) of using the at least one computer for calculating club energy (Eg) of the golf club at the time (Tf); and a step (St 5 ) of using the at least one computer for quantitatively evaluating club suitability based on the power integration value (Sp) and the club energy (Eg); wherein each of the power index values (Pw) is a value which is correlated to power of a work provided from the golf player to the golf club; and wherein the club suitability is evaluated based on a ratio (Sp/Eg) of the power integration value (Sp) relative to the club energy (Eg).