A lot of golfers know their swing speed. Much less know their bullet speed, the number that gives you a better indication of how far a shot can go.
The examples below are modeled scenarios provided by GOLFJOY to demonstrate how ball speed works. There are no measured averages for all golfers.
Ball speed vs. swing speed
Swing speed (or club speed) is the speed at which the club head moves at impact. Ball speed is how fast the ball is moving just after it leaves the face. The link between them is smash factor which is the bullet speed you get for every mph of club speed.
Ball speed = club speed × smash factor
Take two golfers with the same 100 mph driver swing. The Golfer A has a smash factor of 1.40 and a ball speed of 140 mph. The Golfer B has a smash factor of 1.48 and a ball speed of 148 mph. Golfer B gets eight more mph without swinging faster because more of the swing energy is transferred to the ball.
A few things decide how much.
- The club itself. Face design and construction are different from club to club, which can move the smash factor even when the swing is the same.
- Where the ball hits the face. Strikes near the center are the most effective. Hits towards the heel, toe, top or bottom of the face lose the speed of the ball.
- The loft at impact. The loft that the club has when it meets the ball, which may differ from the loft printed on the club, changes how much energy goes into the ball.
- The golf ball. Firmer, higher compression balls generally produce more driver ball speed than softer ones. In MyGolfSpy’s 2025 Golf Ball Test, the distance between the fastest and slowest balls was about six mph for the fastest swingers, four mph for average speed golfers and two mph for the slowest swingers.
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How much ball speed should you have per club?
The speed of the ball decreases as it moves into the bag. The clubs get shorter, so you hit them slower and they get higher, which reduces the smash factor. Ball speed also depends on swing speed so the chart groups golfers by driver swing speed.
Find your driver swing speed and read it. On a 95 mph driver swing, for example, you’ll see about 138 mph ball speed with the driver, 104 mph with a 7 iron and 88 mph with a pitching wedge. A faster swinger will produce more ball speed, but that doesn’t always make them the best ball striker. They just run faster.
How much does smash factor impact ball speed?
The fairest way to judge your ball speed is against your own swing speed. Divide the speed of the ball by the speed of the club and you have your smash factor. With a driver, close to 1.50 is as effective as it gets.
At a 95 mph swing, going from a smash factor of 1.40 to 1.49 increases ball speed from about 133 to 142 mph, almost nine mph more without swinging faster.
How to measure your bullet speed
You can’t feel the speed of the ball, so the only reliable way to know your number is a launch monitor. Accuracy is important because the smash factor depends on two measures: the speed of the club and the speed of the ball. If one is off, your smash factor is also off. The gap between a 1.40 and a 1.49 is only about nine mph so a few mph of error can hide.
Take a full session and watch your average, not your best, shot.
by GOLFJOY Spica 3 measures 27 data points on every shot including club speed and ball speed. Its monitors especially go further with up to 42 on the Rigel 3 Proadding details such as face angle, face to road and dynamic loft.
The benefit of knowing your ball speed and smash factor is understanding how much more effective your golf swing could be. If your driver smash factor is already close to 1.50, there is not much more to be gained from better contact, so the extra ball speed must come from swing speed.
The place How Much Ball Speed Should You Have? appeared first MyGolfSpy.