Cycling Power Zone Calculator

Understanding Cycling Power Zones

Power-based training zones divide your cycling intensity into distinct levels based on your Functional Threshold Power (FTP). Unlike heart rate, power is an instantaneous and objective measure of your output, making it the gold standard for structured cycling training.

What is FTP?

Functional Threshold Power (FTP) is the highest average power you can sustain for approximately one hour. It represents your lactate threshold — the intensity above which fatigue accumulates rapidly. All power training zones are expressed as a percentage of your FTP.

Coggan vs Polarized Models

The Coggan model, developed by Dr. Andrew Coggan, divides power output into seven zones ranging from Active Recovery to Neuromuscular Power. It is the most widely used system in cycling and provides granular control over training intensity.

The Polarized model simplifies training into three zones: low intensity, threshold, and high intensity. Research suggests that elite endurance athletes spend roughly 80% of their training time in Zone 1, with the remainder split between threshold and high-intensity work.

How to Test Your FTP

The 20-minute test is the most common field test. After a thorough warm-up, ride as hard as you can sustain for 20 minutes. Your FTP is estimated as 95% of your average power for that effort.

The ramp test is a progressive protocol where power increases every minute until failure. Your FTP is estimated as 75% of the highest 1-minute power achieved. Ramp tests are shorter and less mentally demanding than the 20-minute test.

Training Tips by Zone

• Zone 1-2 (Recovery & Endurance): The foundation of cycling fitness. These easy rides build aerobic capacity and promote recovery without accumulating excess fatigue.
• Zone 3 (Tempo): Sustained moderate efforts useful for building muscular endurance. Common in group rides and fondos but should be balanced with easier and harder sessions.
• Zone 4 (Threshold): Efforts near your FTP. Time trials and threshold intervals in this zone directly improve your sustainable power.
• Zone 5-7 (VO2 Max, Anaerobic & Sprint): High-intensity work that develops peak power and anaerobic capacity. Limit to 2-3 sessions per week with adequate recovery between efforts.