Goalkeeper Glove Sizing Guide
Measure your palm size:
Use a tape measure to measure all the way around the widest part of your palm, excluding your thumb. If you don't have a tape measure, use a string and measure that against a ruler.
Measure both hands and add 1 inch to the largest measurement (goalkeeping gloves should be worn slightly larger than hand size). For example, if your longest measurement is 7 inches, your glove size is 8.  If you are a half size, you should round up to the next size.  For example, if you measure 7.5" around the palm, round up to 8", add an inch and your glove size will be 9.