What is the approximate inside diameter of a golf cup?

• A. 3 inches
• B. 5 inches
• C. 6 inches
• D. 4 inches

Answer: (D)

The size of the golf cup opening is chosen so a regulation golf ball can drop through with a bit of clearance. A golf ball is about 1.68 inches in diameter, so a hole around four inches across gives reliable clearance without being oversized. The approximate inside diameter used here is four inches, which matches common practice and the given answer. A 3-inch hole would be too small for the ball to pass consistently, while 5 or 6 inches would be much larger than standard and would change how play works. Some official references list 4.25 inches as the exact standard, but four inches is the commonly cited approximate size for practical purposes.