You must have proper understanding of the game and your style of golf club swing. Gauge the exact length (distance from wrist to ground), measure your hands (it includes hand size as well as the size of your fingers), determine your golf club swing speed, trajectory and flight patterns.
On average, amateurs swing their golf club at about 85/90 MPH; whereas, the professionals swing at approximately 110/120 MPH or more.
Use golf clubs of different sizes in practice
During practice, have multiple golf clubs in your cart and hit several shots with each one of them to see which size suits you the most. A professional golf club fitter will take into account a number of things like how much you flex your knees, how you set the ball, your grip, stance etc.
Use a tape
Apply a tape to the bottom of the club and see where the golf club hits the ground. This process will leave a mark at the center of the bottom of the golf club. It will help you understand the size of the club you require to perform well.
Consult your seniors
If you are a beginner, it is always wise to learn from someone else’s experience. Consult your seniors about different sizes of the golf club and which one would suit your style of play. This will save a lot of time and headache.
Find a golf club fitter
Search online for a local golf club, club fitter or a golf retail center which offers golf club fitting services. Get your golf clubs checked every year to ensure that you are using the right size.