FAQ: What is Tempo Ratio?
What does Tempo Ratio measure?
Tempo Ratio is the time your backswing takes divided by the time your downswing takes. A ratio of 3.0 means your backswing is three times longer than your downswing — the same tempo Tour pros average.
How is it measured?
MotionEdge uses the Apple Watch's built-in motion sensors (accelerometer and gyroscope) sampling at 100–200 times per second. The Watch detects three key moments in your swing:
- Takeaway — when your wrist transitions from stillness to sustained motion
- Top of backswing — when your wrist rotation reverses direction (the pause at the top)
- Impact — the sharp deceleration spike when the club strikes the ball
Backswing duration = takeaway to top. Downswing duration = top to impact. The ratio is backswing divided by downswing.
Why does it matter?
Consistent tempo is one of the strongest predictors of ball-striking quality. Most amateurs rush the downswing (ratio below 2.5) or have an overly slow backswing (ratio above 4.0). Training toward a consistent 3:1 ratio builds a repeatable, rhythmic swing.
How accurate is it?
The three phase landmarks are based on strong physical signals — impact produces a massive acceleration spike, the top of backswing is a clean rotation reversal, and takeaway is the transition from stillness. The downswing measurement (top to impact) is especially precise because both endpoints have unambiguous sensor signatures. On Apple Watch Series 8 and later, the system automatically refines measurements using 200Hz high-resolution sensor data.
What is a good Tempo Ratio?
| Rating | Ratio Range |
|---|---|
| Tour average | 3.0 |
| Green (on target) | 2.55 – 3.45 |
| Yellow (close) | Outside green but within reason |
| Red (needs work) | Significantly outside target |
The default target is 3.0 with ±15% tolerance, but you can customize the target in your Training Profile (App Settings > Training Profiles on iPhone, or Settings > Training on Apple Watch) to match your personal swing.
Do I need my phone during a swing?
No. All tempo detection runs entirely on the Apple Watch. Results are synced to your iPhone after the session.