If you’ve ever held a golf ball, you’ve probably noticed it is covered in hundreds of tiny dents. But have you ever stopped to wonder: Why aren’t golf balls perfectly smooth?

When our family first started playing, our daughter asked this exact question on the putting green. It turns out, those little dents—called dimples—aren’t just for decoration. They are a critical piece of aerodynamic engineering!

Q: Why do golf balls have dimples?

A: Dimples reduce aerodynamic drag and create lift, allowing the golf ball to fly up to twice as far as a smooth ball.

Here is the simple science behind how it works:

1. Reducing Drag (Slicing Through the Air)

When a perfectly smooth ball flies through the air, it creates a large “wake” of low-pressure air behind it (similar to the wake behind a fast-moving boat). This low-pressure wake acts like a vacuum, pulling the ball backward and drastically slowing it down.

Dimples solve this problem by creating a thin layer of turbulent air clinging to the surface of the ball. This turbulent layer forces the passing air to follow the curve of the ball further around to the back. This shrinks the size of the wake, reducing the backward drag by up to 50%!

2. Creating Lift (Staying in the Air Longer)

When you hit a golf ball with an iron or driver, the clubface imparts “backspin.” As the dimpled, spinning ball flies forward, the dimples grab the air. They force the air flowing over the top of the ball to move faster than the air flowing under the bottom.

According to physics (Bernoulli’s principle), faster-moving air creates lower pressure. The high pressure under the ball pushes it upward toward the low pressure on top, creating lift—exactly like an airplane wing!

Q: How many dimples are on a standard golf ball?

A: Most modern golf balls have between 300 and 400 dimples.

The exact number, pattern, and depth of the dimples vary by brand. For example, a Titleist Pro V1 features exactly 388 dimples, while a Callaway Chrome Soft features 332. Manufacturers spend millions of dollars testing different dimple patterns to optimize the trajectory and distance for different types of players.

Q: What would happen if you hit a perfectly smooth golf ball?

A: It would drop out of the sky very quickly.

If a professional golfer hit a perfectly smooth golf ball with their driver, it would only travel about 130 yards. Thanks to dimples, that exact same swing sends a modern golf ball flying over 300 yards!

The next time you tee up, take a moment to appreciate those tiny craters. They are the invisible wings keeping your shots in the air!