It turns out that the fingernail on your pinky finger will grow faster than any of the others. On average, your pinky fingernail will grow about six times faster than your thumb nail. There are a few reasons for this, but one of the most common is because of a condition known as onychogryphosis. This condition usually occurs in people who have long fingers and it causes their fingertips to curve down over the nail bed. The result is an increased rate of growth with an increase in curvature in these fingers.