Determining your glove size is easy...it's the width of your hand, not the length, that's important.
Take a tape measure or piece of string and wrap it around your dominant hand (right hand if right handed) at the widest point across the palm and over the back of the hand. Normally just above the knuckles will be the correct point (above=in the direction of the wrist).
Do not include the thumb. The tape should pass between the forefinger and thumb. Close your fist slightly, so your hand is naturally relaxed.
This measurement in inches is your glove size. It is important to be accurate as every half-inch is a different size.
If between sizes, we suggest you round down: Gloves should be snug (but not tight) when first tried on. They will soon accommodate the shape of your hand.
Different glove manufacturers have different size scales, so we suggest you use the measurement to find your size.