Measure around the palm below the knuckles
Lay the dominant hand flat and wrap a flexible tape around the widest part of the palm just below the knuckles, excluding the thumb. Keep the tape comfortably snug. If using string or paper, mark the overlap and measure it with a ruler.
Use the rounded circumference with the matching chart
The default method rounds the hand circumference upward to the next half inch before assigning the general letter and numeric size. Men's and unisex ranges differ from women's ranges, so the same hand measurement can produce a different letter size.
Treat the result as a starting point for material gloves
Sizing varies by manufacturer, glove material, lining, intended fit, finger length, hand shape, and product type. This chart is intended for ordinary material gloves or mittens, not baseball gloves, baby mittens, specialized kitchen gloves, or safety gloves governed by hazard-specific standards.