The diameter of a golf hole is 4.25 inches, which is regulated by the United States Golf Association (USGA). The USGA states that the hole shall be 4-1/4 inches in diameter and at least 4 inches deep. The depth of the hole is important so that the flagstick can be properly inserted and removed without damaging the putting green.
There are several reasons why the golf hole has remained at 4.25 inches for over 100 years. The first reason is that it is a manageable size for most golfers. A larger hole would make it too easy to score, while a smaller hole would make it too difficult.
Another reason is that this size allows for consistent greenskeeping. If the holes were any larger, they would need to be mowed more often which would damage the greens; if they were any smaller, they would need to be raked more often which would also damage the greens.
Lastly, this size just feels “right” for most people – it’s not too small or too big. It’s challenging but still achievable, and that’s what makes playing golf so enjoyable!