Cycling Power Zones Calculator

This calculator determines your personalized training zones by starting with your Functional Threshold Power (FTP). FTP is generally estimated using a recent 20-minute maximum effort and is the most crucial metric. Once we have this baseline number, the tool applies various scientific models—such as Coggan's Structured Training or Polarized methodologies—to break down that single number into actionable power ranges.

For example, if your FTP is 250 watts:

• Sweet Spot: You might see a target zone of 88% to 93% of FTP (approx. 220-233 watts), ideal for sustained effort development.
• Threshold Zone: This will calculate the power needed for your highest intensity efforts, typically around 95% to 105% of FTP.

By selecting different models (e.g., British Cycling vs. Coggan), you can see how slightly differing scientific approaches adjust the target percentages for optimal training specificity.

To maximize the effectiveness of your power zone workouts, focus on variety and consistency. View these zones not as fixed numbers, but as targets for effort management.

• Mix Intensity: A balanced week should include a mix of low-intensity Zone 2 rides (long duration, easy recovery) and focused high-intensity work. This stimulates both aerobic base building and specific power development.
• Use the FTP as a Guide, Not a Limit: Your calculated FTP is an estimate. If you feel significantly fatigued or unwell, dial back your targets by 5-10% regardless of what the calculator suggests.
• Consistency Over Intensity: Three solid, structured rides per week using these zones are far more beneficial than one massive, grueling ride followed by several days off.

  Track your performance against these calculated zones over time; seeing steady increases in wattage at the same percentage (e.g., 230 watts for Sweet Spot) is how you know your training is paying off.