FTP Estimator
Estimate functional threshold power from a 20-minute test, with training zones.
Quick answer: enter your details below and click Estimate FTP — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Ride a hard, steady 20-minute effort and note average power.
- Enter that power in watts.
- Click Estimate FTP.
About this tool
Enter your best average power over 20 minutes. The tool estimates FTP as 95% of that effort, a widely used rule of thumb, and prints the usual seven training zones. This is an estimate: a lab test or a longer effort can give a different number, and zones are guides, not prescriptions.
Frequently asked questions
Is 95% exact?
No. It is a rule of thumb; some riders test a little above or below it.
Should I train only by these zones?
Zones are guides. Feel, fatigue, and a coach's plan still matter.