Grip sizes

Adult tennis racquet grip sizes range from 4 1/8" to 4 5/8" and increase in size by 1/8" at a time. A tennis racquets grip size is usually shown on the butt cap of the handle and is displayed in one of two ways:
US system - full grip size in inches i.e. 4 3/8"
or

European system - a numerical value from 1 to 5, which equals the 'number of eights of an inch' i.e.

G1 = 4 1/8"
G2 = 4 2/8" (4¼")
G3 = 4 3/8"
G4 = 4 4/8" (4½")
G5 = 4 5/8"

Selecting the correct tennis racquet grip size will not only help your game but will also help you avoid injury, you should be able to grip the racquet handle comfortably without over squeezing. A grip that is too small requires more muscle strength to keep the racquet from twisting in your hand and can lead to problems with tennis elbow. A grip that is too large inhibits wrist snap on serves, makes changing grips more difficult and also requires more muscle strength, this too can lead to tennis elbow and wrist injuries.

Measuring your grip size

The easiest way to measure your tennis racquet grip size is by holding the tennis racquet handle with an eastern forehand grip (the palm should be placed against the same bevel as the string face), if the tennis racquet is your correct grip size you should be able to fit the indexfinger of your other hand in the space between your ring finger and palm. (see picture)