Guide
How accurate are golf launch monitors?
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In short
Home launch monitors are generally good at the numbers they measure directly, such as ball speed and, on many units, launch angle and club speed. Numbers they calculate, such as carry on some radar units or spin on models that do not measure it, are estimates and can be less reliable. Set-up, ball type and room conditions cause most bad readings, so a careful set-up matters as much as the model.
Products for this job
Compare all 8 productsVoice Caddie SC4 Pro: radar, spin, built-in screen
Check price on AmazonAffiliate linkRapsodo MLM2PRO: cameras plus radar, measured spin
Check price on AmazonAffiliate linkSkyTrak ST MAX: dual radar and photometric cameras
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Launch monitors range from pocket radar units to premium camera systems, and they all show carry distances to the yard. That precision on screen can hide big differences in how the numbers are produced. This explainer covers the difference between measured and calculated data, which numbers are usually reliable on home units, what causes bad readings and how to judge whether your monitor is giving you useful information.
Measured against calculated
Every launch monitor measures some numbers directly and calculates others from them. Radar units measure the ball's speed and movement as it flies. Camera units photograph the ball at and just after impact. From those raw measurements, software calculates the rest using a ball flight model.
Makers increasingly state which numbers are measured. The Rapsodo MLM2PRO listing, for example, says it gives 13 metrics, 6 of them measured, including spin rate and spin axis. If a monitor does not say spin is measured, assume it is calculated. Our launch monitor numbers explained covers what each number means.
Which numbers are usually reliable
Ball speed is the most robust number on almost every monitor, because it is the easiest to measure. Club speed from radar units is usually good. Launch angle is reliable on camera units and many radar units. Spin is the hardest: measured spin needs either good radar tracking with enough flight or camera images with clear ball markings. Carry and total distance are always calculated from the launch data and a model, so they are only as good as the inputs.
| Number | Usually | Notes |
|---|---|---|
| Ball speed | Measured, reliable | Most robust number |
| Club speed | Measured on radar | Some camera units calculate it |
| Launch angle | Measured on most | Check the listing |
| Spin rate | Measured on some, calculated on others | Least reliable on budget units |
| Carry distance | Calculated | Depends on all the above |
| Smash factor | Calculated | Ball speed divided by club speed |
What causes most bad readings
Most inaccurate numbers come from set-up rather than the hardware. A monitor that is not level or not aligned to the target will report wrong direction and can skew carry. Radar units too close to a net see too little flight. Camera units in poor light, or with worn or unmarked balls, misread spin. Choosing the wrong club in the app can upset units that use the club to calculate data.
Our launch monitor not picking up shots and indoor vs outdoor launch monitor guides cover set-up in detail.
- Not level or not aligned.
- Net too close for radar.
- Poor or flickering light for cameras.
- Range balls, foam balls or worn balls.
- Wrong club selected in the app.
- Altitude or conditions not set.
Consistency matters more than exact accuracy
For practice, a monitor that gives consistent numbers is more useful than one that is exactly right on some shots and wrong on others. If your 7 iron shows a steady ball speed and launch from session to session, you can see the effect of changes in your swing even if the carry is a few yards out compared with a premium system. Look at averages over several shots, not single numbers.
Testing your own monitor
You can sense check a monitor on a range or a quiet hole. Hit a few balls with one club, note the carry figures, then walk out and check landing spots with a laser or GPS. Compare ball speed and launch with published typical figures for your club speed, and see whether results change when you move the monitor slightly. If ball speed is steady and sensible, the unit is working; carry differences are more likely conditions or the model.
- 1
Set up carefully on level ground, aligned to a target.
- 2
Hit ten balls with one club.
- 3
Note average ball speed, launch and carry.
- 4
Check landing spots with a laser or GPS where safe.
- 5
Repeat in a second session and compare averages.
Are golf simulators accurate?
A simulator shows the ball flight that its software calculates from the monitor's data. Accuracy depends first on the monitor and second on the software's ball flight and roll models. Putting and short chips are where many home simulators feel least realistic. Golf simulator software explained covers this.
Choosing for accuracy
If accurate spin and full ball flight matter, look for monitors that state measured spin and use camera or combined camera and radar technology. If you mainly want ball speed and carry for gapping, a well set up radar unit is often enough. Our best golf launch monitors and best launch monitors under 700 guides note measured metrics where listings state them.
Frequently asked questions
Are cheap launch monitors accurate? They are often good for ball speed and club speed. Spin and carry are usually less reliable.
Is spin measured or calculated? It depends on the model. Check whether the maker says spin is measured.
Why does my monitor disagree with the range? Range balls, conditions, alignment and calculated carry all cause differences.
What you need
- Check price on AmazonAffiliate link
Voice Caddie SC4 Pro: spin and a built-in screen