FTP Zone Calculator

What FTP zones are for

FTP zones turn a single threshold power estimate into practical training targets. Zone 2 supports endurance work, tempo builds steady fatigue resistance, threshold work targets sustained hard effort, and VO2 max work is usually shorter and more demanding. Power zones are useful because they keep sessions from drifting into the wrong intensity.

The training-zone idea fits the way British Cycling describes using power to manage cycling intensity.

FTP zone limitations

FTP is an estimate, not a fixed biological wall. If FTP is set too high, endurance rides become too hard and interval workouts may fail. If FTP is set too low, workouts may not be challenging enough. Retest or adjust FTP when repeated workouts clearly feel mismatched.

Frequently asked questions

• Why should cycling calculators include more than one result?
  Cycling numbers are connected. A rider who asks for pace often also needs speed, finish time, splits, and sometimes power or cadence context. A useful calculator should therefore show the main answer plus the nearby values that help someone apply it in training or racing. For example, a cycling pace result is more helpful when it also shows average speed in km/h and mph, time per 5 km, time per 10 km, and how the pace changes if the rider rides slightly faster or slower.
• Are these cycling calculator results exact?
  The arithmetic results are exact for the values entered, but real riding is affected by wind, road surface, gradient, drafting, tire pressure, stops, cornering, and fatigue. A flat-road speed calculation may be mathematically correct while still being unrealistic on a hilly or windy route. Treat the calculator as a planning tool, not a guarantee of what will happen outside.
• Should I use miles or kilometers?
  Use the unit system that matches your event, training log, or bike computer. Most international cycling events and training plans use kilometers, while many riders in the United States still think in miles. A strong calculator should support both and show clear conversions so the rider does not have to use a second tool.
• How can these calculators help with training?
  They help turn vague goals into measurable targets. Instead of saying “ride harder,” a rider can plan a target split, cadence, watts per kilogram, FTP zone, or gear ratio. That makes training easier to repeat and compare over time. The real value comes from using the result consistently with perceived effort, heart rate, power data, and recovery status.
• How often should FTP be updated?
  Many riders update FTP every 4 to 8 weeks, or after a clear improvement in fitness. It should not be changed after every ride. Look for consistent evidence: repeated workouts feeling too easy or too hard, a formal test, or a reliable coach/platform estimate.