# Launch monitor numbers explained

Source: https://pinandyard.co.uk/blog/launch-monitor-numbers-explained
Published: 2026-10-12
Publisher: Pin and Yard

**In short:** Club speed is how fast the clubhead moves at impact; ball speed is how fast the ball leaves the face. Smash factor is ball speed divided by club speed and shows strike quality. Launch angle and spin decide how high the ball flies and how it curves. Carry is how far it flies before landing, and total adds the roll.

Launch monitor screens can show a dozen numbers per shot, and it is easy to get lost. A handful matter most, and they link together in a logical chain: speed creates distance, strike quality turns club speed into ball speed, and launch and spin shape the flight. This explainer covers each number in turn, what changes it, and how to use it in a practice session, with links to our smash factor calculator and buying guides.

## The numbers at a glance

| Number | What it means | Mainly changed by |
| --- | --- | --- |
| Club speed | Clubhead speed at impact | Swing speed, fitness, technique |
| Ball speed | Ball speed just after impact | Club speed and strike quality |
| Smash factor | Ball speed divided by club speed | Centred strike, club design |
| Launch angle | Vertical angle the ball starts on | Loft at impact, angle of attack |
| Spin rate | Backspin in rpm | Loft, strike, ball, conditions |
| Spin axis | Tilt of the spin, causes curve | Face to path relationship |
| Apex | Highest point of the flight | Ball speed, launch, spin |
| Carry | Distance in the air | All of the above |
| Total | Carry plus roll | Carry, landing angle, ground |

Common launch monitor numbers

## Club speed and ball speed

Club speed is the headline number for speed training, and most units measure it, including simple radar models such as the PRGR and the Swing Caddie SC200 Plus, whose listing adds a swing speed mode without a ball. Ball speed is what actually sends the ball forward. More club speed usually means more ball speed, but only if you hit the middle of the face.

## Smash factor

Smash factor is ball speed divided by club speed. Because both are in the same units, the units cancel out. It shows how efficiently you transfer energy. The Rules of Golf limit how springy a driver face can be, so a well struck driver tops out at about 1.50. Irons have more loft and produce lower figures, and wedges lower still. A sudden drop in smash factor at the same club speed usually means an off-centre strike. Our [smash factor calculator](https://pinandyard.co.uk/tools/smash-factor-calculator) works it out from your numbers in mph, km/h or m/s.

[Work out your smash factor](https://pinandyard.co.uk/tools/smash-factor-calculator)

## Launch angle and spin

Launch angle is the vertical angle at which the ball leaves the face. It depends mainly on the loft at impact and whether you hit up or down on the ball. Spin rate, in revolutions per minute, controls lift: too little and the ball falls out of the sky, too much and it balloons and loses distance. Drivers typically want lower spin than irons, and wedges spin the most, which helps them stop on the green. Spin axis is the tilt of that spin, which makes the ball curve left or right.

Not every unit measures these. Camera and hybrid units such as the Rapsodo MLM2PRO list spin rate and spin axis among their measured metrics; radar units such as the Voice Caddie SC4 Pro list spin rate, side spin and back spin. Simpler units may estimate them or leave them out. Our [launch monitor explainer](https://pinandyard.co.uk/blog/how-do-golf-launch-monitors-work) explains the difference.

## Apex, carry and total

Apex is the highest point of the flight. Carry is how far the ball flies before it lands, and is the most useful number for choosing clubs, because hazards and greens are mostly about carry. Total adds the roll after landing, which depends heavily on ground conditions. On soft British turf in winter, roll is short, so carry is the number to learn.

Carry is almost always calculated from ball speed, launch and spin using a ball flight model. That is why different units can disagree. Use the same unit consistently and look at trends over a session rather than single shots.

## Using the numbers in practice

For units that show these numbers, see our [launch monitor guide](https://pinandyard.co.uk/best/best-golf-launch-monitors) and, for lower priced options, the [under £700 guide](https://pinandyard.co.uk/best/best-golf-launch-monitors-under-700).

1. Warm up, then hit five to ten shots with one club and note the average carry.
2. Check smash factor; if it varies widely, work on centred contact first.
3. Look at launch and spin with your driver to see whether you are launching too low or spinning too much.
4. Repeat for each club to build a carry chart you can use on the course.

Note: Keep a safe distance between you, the unit and any onlookers, and make sure the ball cannot rebound towards anyone when hitting into a net.

## Frequently asked questions

**What is a good smash factor?** A well struck driver can reach about 1.50, the practical limit set by equipment rules on face springiness. Irons sit lower. Consistency matters more than chasing the maximum.

**Which number should a beginner watch?** Carry distance for each club, then smash factor to check strike quality.

**Why is my carry different from my friend's monitor?** Carry is calculated with each maker's ball flight model, and inputs like spin may be estimated differently. Compare like with like.

## Buying guides on this topic

- https://pinandyard.co.uk/best/best-golf-launch-monitors
- https://pinandyard.co.uk/best/best-golf-launch-monitors-under-700
- https://pinandyard.co.uk/best/best-launch-monitors-for-home-simulator

## Sources

- [The R&A, Rules of Golf](https://www.randa.org/en/rog/the-rules-of-golf)