The term signifies the efficiency of energy transfer from the club head to the golf ball at impact. It is calculated by dividing the ball speed by the club head speed. For example, if a club head speed is 100 mph and the resultant ball speed is 150 mph, the value is 1.5. This numerical relationship indicates how effectively the club head’s momentum propels the ball forward.
A higher number generally reflects a more centered hit on the club face and a better transfer of power, leading to increased distance. Optimizing this value is a critical element in maximizing potential distance for golfers. The concept has become more prevalent with the advent of launch monitors, allowing golfers and instructors to quantify and analyze the quality of impact.