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Smash factor calculator

Enter the ball speed and club speed from your launch monitor in the same unit. The units cancel, so smash factor has none.

In short

Smash factor = ball speed / club speed. The R&A and USGA limit on clubface spring (COR 0.830) means drivers top out at about 1.50; irons sit lower. A reading above 1.52 is most likely a misread by the monitor.

Work out smash factor

Speeds in
BALL
CLUB
SMASH

148.0

mph

100.0

mph

1.48

no unit

The R&A and USGA limit on clubface spring (COR 0.830) means drivers top out at about 1.50. Irons sit lower, and wedges lower still.

club speed 100 mphball speed 148 mphsmash 148 / 100 = 1.48launch 12°apex heightspin, rpmcarry distance
The main launch monitor numbers. Smash factor is ball speed divided by club speed.

Unit conversions

FromTo mph
km/hx 0.6214
m/sx 2.2369
Smash factor itself has no unit: both speeds just need to be in the same unit.

A driver strike out of the centre of the face gets close to 1.50; the limit on how springy a clubface may be (COR 0.830) stops it going much higher. Irons and wedges have more loft, so their smash factor is naturally lower.