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The measurement for a glove is based on the distance from the crook, or crease, of your elbow to your middle finger. Bend your elbow slightly. Place the end of a soft measuring tape where the crease in your elbow begins. Then measure along the underside of your forearm, stopping at the base of your middle finger. Hockey gloves are sized according to whole inches. Once you have your measurement, you'll have to round to the nearest inch. So if your measurement has less than 0.5 inches (1.3 cm) over a whole inch, round down. If it has more than 0.5 inches (1.3 cm) over a whole inch, round up. That measurement in inches is your glove size.  For example, if your measurement is 11.75 in (29.8 cm), round up to 12 in (30 cm). If your measurement is 11.25 in (28.6 cm), you would round down to 11 in (28 cm).
Bend your arm at the elbow. Measure from the bend in your elbow to the base of your middle finger. Round to the nearest inch to find your size.