There are two reliable ways to find your tennis racket grip size: the ruler method (no racket needed) and the finger test (if you already have a racket in hand). Both take under a minute and point you to the same answer, a number between 0 and 5 that corresponds to the handle’s circumference in inches.
The Ruler Method
Open your hitting hand with your fingers extended and held close together. Place a ruler along the bottom lateral crease of your palm, the horizontal line that runs across the base of your hand just above the wrist. Measure from that crease to the tip of your ring finger. The distance in inches maps directly to a grip size:
- 4 inches: Grip size 0
- 4 1/8 inches: Grip size 1
- 4 1/4 inches: Grip size 2
- 4 3/8 inches: Grip size 3
- 4 1/2 inches: Grip size 4
- 4 5/8 inches: Grip size 5
Most adult players land somewhere between grip size 1 and grip size 4. If your measurement falls between two sizes, go with the smaller one. It’s easier to build up a grip that’s slightly too small than to shave down one that’s too large.
The Finger Test
If you already have a racket, hold it in an eastern forehand grip. That means placing your palm flat against the same bevel that faces in the same direction as the string bed, as if you’re giving the racket a handshake. Your pointer finger knuckle should line up with the top-right bevel of the handle.
Now look at the gap between your fingertips and the base of your palm. You should be able to slide the index finger of your other hand into that space. If your index finger fits snugly, the grip size is correct. If there isn’t enough room for your finger, the grip is too small. If there’s leftover space between your finger and your palm, the grip is too large. This test is quick and surprisingly accurate, making it the best option when you’re trying rackets in a shop.
Sizing for Junior Players
Children’s rackets use a different scale that starts well below adult sizes. Babolat’s junior sizing, which is representative of most brands, breaks down like this:
- Hand measurement 87–89 mm: Grip size 00000 (3 1/2 inches)
- Hand measurement 90–92 mm: Grip size 0000 (3 5/8 inches)
- Hand measurement 93–95 mm: Grip size 000 (3 6/8 inches)
- Hand measurement 96–99 mm: Grip size 00 (3 7/8 inches)
For kids, the same ruler method works. Measure from the palm crease to the ring finger tip, but use millimeters for a more precise match. The same rule applies: when in doubt, choose the smaller size and add an overgrip later.
Adjusting a Grip That’s Close but Not Quite Right
A standard overgrip adds roughly 0.4 to 0.6 mm of thickness to the handle. That’s not a dramatic change, but it can be enough to bump a grip that feels slightly thin into comfortable territory. If you need to go up a full size (one increment on the chart), wrapping an extra layer of material beneath a replacement grip can get you there. Some players use a heat shrink sleeve for this purpose, though it’s generally only practical for building up one size at most. Trying to add two sizes’ worth of bulk to a handle creates an uneven, padded feel that changes the way the racket plays.
Going down in size is harder. You can remove the original replacement grip and apply a thinner one, or play with just an overgrip on the bare handle, but both options feel noticeably different. This is the main reason to start with the smaller grip when you’re between sizes.
Why Grip Size Affects Your Arm
Grip size isn’t just a comfort preference. A study published in PubMed found that there is an optimal grip diameter that reduces the force your hand muscles need to generate during a stroke. When the grip is too small, you squeeze harder to keep the racket stable, which overloads the tendons on the outside of your elbow. The researchers confirmed that the wrist extensor muscles are heavily engaged during forehand strokes, and that mechanical overuse of those tendons is a direct risk factor for lateral epicondylalgia, commonly known as tennis elbow.
A grip that’s too large creates a different set of problems. Larger handles limit wrist mobility, which means you absorb more shock on impact and lose fine control over the racket face. That extra strain transfers to the muscles and tendons in both the wrist and elbow. In short, a grip that’s wrong in either direction makes injury more likely over time.
Smaller Grips and the Modern Game
Professional players have trended toward smaller grip sizes in recent years, and it’s worth understanding why even if you’re a recreational player. A smaller grip allows more wrist freedom, which translates to greater spin potential. Players can snap the racket head through the ball more aggressively, generating the heavy topspin that defines modern tennis. That same wrist flexibility also helps with drop shots, sharp angles, and quick grip changes between forehand and backhand.
Smaller grips also encourage a more relaxed hold on the handle. A loose grip reduces tension in the forearm, which over hundreds of shots per session can meaningfully lower the strain on your arm. That said, going too small just to chase extra spin will backfire if your hand is cramping or you’re fighting the racket on serves and volleys. The right grip size is still the one that matches your hand measurement and lets you play comfortably for a full session without fatigue or pain.