Golf shaft flex calculator
Which flex suits you?
Enter your driver swing speed and see the shaft flex three published guides suggest, and where they disagree.
Clubhead speed, not ball speed. A launch monitor or simulator bay will show it.
Where to start
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Enter your driver clubhead speed.
How it's worked out
Shaft flex is matched to how fast you swing a driver: the faster the clubhead, the stiffer the shaft. There's no single official table. Makers and fitters each publish their own bands, and they don't agree at the edges.
So we show three published guides side by side. In the middle of each band they agree; near a boundary they differ by 5 to 15 mph, and we say so rather than pick one.
Use the answer as where to start testing. Tempo, shaft weight and feel matter too, and a fitting on a launch monitor is the way to be sure.
Sources: TGW golf shaft flex guide · Golfer Geeks shaft flex chart · Next Round shaft flex chart · checked 5 Nov 2026
A 90 mph swing
At 90 mph all three guides say regular. At 82 mph they split: two say senior and one says regular, so test both.
Questions
How do I find my swing speed?
Hit a few drivers on a launch monitor, at a range, a simulator bay or a fitting. Use clubhead speed, not ball speed.
What if I'm between two flexes?
Try both. The guides themselves disagree near the edges, and the right shaft depends on your tempo and how you load it, not just speed.
Is senior flex only for older golfers?
No. Senior, or A, flex is for slower swing speeds at any age; the name is a convention.
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