The most accurate method of determining the correct grip size is to measure the length from the tip of the ring finger to the middle of the palm of the hand (2nd line). This is your hand measurement. Each measurement corresponds to a matched grip size. The corresponding sizes can be found in the table below:
|EU||US||Hand size (mm)|
|00000||3 1/2||87 - 89|
|0000||4 1/8||90 - 92|
|000||4 1/4||93 - 95|
|00||4 3/8||96 - 99|
If, for example, the ring finger is 94 mm away from the palm, then a grip size 000 will be ideal.
If you hesitate between two grip sizes, know that it is better to have a grip that is too small than too large. Indeed, a too small grip can be covered with an overgrip in order to be slightly enlarged.