Golf ball Size & Weight

A regulation golf ball must be at least 42.67 mm (1.68 in) in diameter and weigh no more than 45.93 g (1.62 oz). Those are minimum and maximum limits set jointly by the USGA and The R&A, so a conforming ball is essentially fixed at about 42.7 mm and 45.9 g.

This guide covers the exact golf ball dimensions, why the rules are written as limits rather than a target, how the ball compares to a ping-pong ball and a coin, and what the dimples do.

Quick Answer: How Big Is a Golf Ball?

A golf ball is 42.67 mm (1.68 in) across at minimum and weighs 45.93 g (1.62 oz) at maximum. In practice, conforming balls sit right at those numbers: about 42.7 mm and 45.9 g. Most have 300 to 500 dimples.

Golf Ball Dimensions at a Glance

• Diameter: 42.67 mm minimum / 4.267 cm / 1.68 in
• Weight: 45.93 g maximum / 1.62 oz
• Circumference: about 134 mm
• Dimples: typically 300 – 500, arranged for symmetry
• Standard: USGA and R&A Rules of Golf, Equipment Rules

What Does a Golf Ball Look Like in Size?

A golf ball is a little larger than a Ping-Pong ball and about the size of a large cherry or a walnut in its shell. Its 42.7 mm diameter is roughly the width of two US quarters side by side, and it disappears easily into a closed hand.

6 Everyday Comparisons for a Golf Ball

1. A ping-pong ball (40 mm, 2.7 g) is about 2.7 mm smaller and 17 times lighter.
2. A US quarter (24.26 mm) is a bit over half the golf ball’s diameter; two quarters side by side ≈ one golf ball across.
3. A tennis ball (67 mm) is about 24 mm larger across.
4. A squash ball (about 40 mm, 24 g) is slightly smaller and half the weight.
5. A walnut in shell (about 40 – 45 mm) is a close visual match.
6. A AA battery (14.5 mm diameter) is about a third of the golf ball’s width.

Golf Ball Size in Different Units

Why the Rules Are Written as Limits

A smaller, denser ball would fly farther, so the rules set a minimum size and a maximum weight to cap distance. The old “British” ball was 41.15 mm and legal in R&A events until 1990; the unified rule adopted the slightly larger 42.67 mm “American” ball worldwide. Because going below the size limit or above the weight limit is banned, manufacturers build right up to both edges, which is why every conforming ball is effectively the same 42.7 mm and 45.9 g.

What the Dimples Do

A smooth ball of the same size would drop out of the air quickly. The dimples trip the airflow into a thin turbulent layer that clings to the ball longer, shrinking the wake and cutting drag by roughly half, while backspin over the dimpled surface generates lift. Dimple count (usually 300 – 500) and shape vary by model, but they do not change the ball’s regulated diameter.

Common Mistakes When Comparing Golf Ball Dimensions

1. Treating 42.67 mm as an exact size. It is a minimum; balls are at or just above it, never below.
2. Assuming weight is fixed. 45.93 g is a maximum; a ball can weigh less, though most do not.
3. Confusing it with the old British ball. That 41.15 mm ball has not been legal since 1990.
4. Thinking more dimples means a bigger ball. Dimple count affects flight, not diameter.
5. Comparing to a ping-pong ball as “the same.” A ping-pong ball is 2.7 mm smaller and vastly lighter.

Frequently Asked Questions

What is the diameter of a golf ball?

At least 42.67 mm (1.68 in); conforming balls are right at that figure.

How much does a golf ball weigh?

No more than 45.93 g (1.62 oz); most weigh essentially that.

Why is the golf ball size a minimum, not a fixed number?

A smaller, denser ball flies farther, so the rules cap distance by setting a minimum size and a maximum weight.

Is a golf ball bigger than a ping-pong ball?

Yes, by about 2.7 mm across, and it is roughly 17 times heavier.

How many dimples are on a golf ball?

Usually 300 to 500, depending on the model.

What was the “small ball” in golf?

The 41.15 mm British ball, legal in R&A play until 1990.

Final Takeaway

A regulation golf ball is at least 42.67 mm (1.68 in) across and no more than 45.93 g (1.62 oz), so conforming balls are effectively fixed at about 42.7 mm and 45.9 g. It is a little larger than a ping-pong ball, about two quarters wide, and its dimples cut drag by roughly half without changing its regulated size.