Tennis Serve Speed
Convert serve speed between km/h, mph, and m/s. Compare your serve to ATP (~190 km/h), WTA (~170 km/h), and the record (Groth 263 km/h). See how long the ball takes to reach the service box.
🎾 Why This Metric Matters
Why It Matters
Serve speed affects match strategy and returner reaction time. At 200 km/h, the ball reaches the service box in ~330 ms. Knowing your speed helps you compare to pros and track improvement.
How It's Applied
Enter your serve speed and select the unit (km/h, mph, or m/s). The calculator converts to all units and computes time to reach the service box (18.29 m) and reaction time for the returner.
Key Insights
- ●ATP avg 1st serve: ~190 km/h. WTA: ~170 km/h.
- ●Record: Groth 263 km/h (163.4 mph).
- ●At 200 km/h, ball reaches service box in ~330 ms.
- ●Grass and indoor hard favor big servers.
📋 Quick Examples — Click to Load
For educational and informational purposes only. Verify with a qualified professional.
🎾 Grand Slam Facts
Sam Groth hit 263 km/h (163.4 mph) in 2012 — official record.
— ATP
ATP players average ~190 km/h on first serve. Isner, Raonic, Karlović exceed 250 km/h.
— ATP
Venus Williams and Sabine Lisicki have topped 200 km/h on the WTA tour.
— WTA
A serve travels 18.29 m from baseline to service line. At 200 km/h (55.6 m/s), the ball reaches the service box in ~0.33 seconds. The returner has roughly 300–400 ms to react. ATP players average ~190 km/h; WTA ~170 km/h. Sam Groth holds the record at 263 km/h (163.4 mph).
Sources: ATP, WTA, ITF.
Key Takeaways
- • 1 mph = 1.60934 km/h. 100 mph ≈ 161 km/h.
- • Time to service box: t = 18.29 m ÷ (speed in m/s). At 200 km/h, t ≈ 330 ms.
- • Grass and indoor hard favor big servers. Clay slows the ball.
- • Returners have ~300–400 ms to react at pro speeds. Reaction time is critical.
Did You Know?
How Does Serve Speed Conversion Work?
Unit Conversion
1 mph = 1.60934 km/h. 1 m/s = 3.6 km/h. The calculator converts between km/h, mph, and m/s.
Time to Service Box
t = d ÷ v, where d = 18.29 m (baseline to service line) and v = speed in m/s. At 200 km/h (55.6 m/s), t ≈ 0.33 s = 330 ms.
Reaction Time
The returner must react within the time the ball takes to reach the service box. At pro speeds, this is 250–400 ms.
Expert Tips
Serve Speed Benchmarks
| Level | 1st Serve (km/h) | 2nd Serve (km/h) |
|---|---|---|
| ATP Pro | ~190 | ~150 |
| WTA Pro | ~170 | ~135 |
| Record (Groth) | 263 | — |
| Club Player | 120–150 | 100–130 |
Frequently Asked Questions
How fast is the average ATP first serve?
ATP players average ~190 km/h (118 mph) on first serve. Top servers like Isner, Raonic, and Karlović regularly exceed 220 km/h. The official record is Sam Groth at 263 km/h (163.4 mph) in 2012.
How fast is the average WTA first serve?
WTA players average ~170 km/h (106 mph) on first serve. Venus Williams and Sabine Lisicki have topped 200 km/h. Serve speeds are typically 15–20 km/h slower than ATP due to physical differences.
How long does it take a serve to reach the service box?
At 200 km/h (55.6 m/s), the ball travels 18.29 m to the service line in ~0.33 seconds. The returner has roughly 300–400 ms to react and prepare the return. At 263 km/h (record), it's ~0.25 seconds.
Does surface affect serve speed?
Yes. Grass and indoor hard courts favor big servers due to lower bounce and faster ball speed. Clay slows the ball and reduces serve effectiveness. Hard courts offer a middle ground.
What is the fastest serve ever recorded?
Sam Groth holds the official record at 263 km/h (163.4 mph) in 2012. John Isner, Milos Raonic, and Ivo Karlović have all exceeded 250 km/h. On the WTA side, Venus Williams has topped 207 km/h.
How do I convert serve speed between km/h and mph?
1 mph = 1.60934 km/h. So 100 mph ≈ 161 km/h, and 200 km/h ≈ 124 mph. The calculator handles km/h, mph, and m/s conversions automatically.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. Serve speeds vary by radar type and conditions. Official records are from sanctioned events. Not a substitute for professional coaching.
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