average hand span
A person's hand size is measured by the length of their hand. A British Study found that hand sizes for males range from 6.25 to 8.1 with an average hand size of 7.44. Female hand sizes overlap, but are generally somewhat smaller, with an average size of 6.77. Hand tools are frequently designed for the average male hand. To figure out the length of your hand, measure the distance from the fold in your wrist below the palm to the tip of your middle finger when your hand is flat. In this photo, for example, the hand length is about 7.25 (or 7-1/4).