The FTP Calculator estimates your cycling Functional Threshold Power from a 20-minute time trial test, and breaks it down into training power zones. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Sports Calculators collection.
What You’ll Need
- Average Power from a 20-minute all-out test
- Body Weight — optional, for watts/kg
Formula Used
FTP = Average 20-minute power × 0.95
Training zones are calculated as percentages of FTP (Coggan power zones).
Example Calculation
Using example inputs — Average Power = 250 W — the FTP Calculator returns:
| Value | Result |
|---|---|
| Estimated FTP | 238 W |
| Zone 4 — Threshold | 217–250 W |
238 W FTP.
Helpful Information
Results from the FTP Calculator are estimates based on the widely used 95%-of-20-minute-power method common in the sports calculators field. For a more precise reading, consider a lab-based ramp test or a longer 60-minute time trial.
Frequently Asked Questions
Is the FTP Calculator free to use?
Yes — the FTP Calculator on Calculate Wiki is completely free, with no sign-up required.
How accurate is the FTP Calculator?
The FTP Calculator uses the standard 95% estimation method from a 20-minute test, which is widely used but still an estimate — actual threshold power can vary with pacing, fatigue, and testing conditions.
Can I use this on my phone?
Yes, this calculator is fully mobile-friendly and works on any modern browser.
What does the result mean?
For the example value shown above (250 W average over 20 minutes), the estimated FTP is 238 W, which then defines your 7 training power zones.