PORT CALCULATOR
Cycling Zones
A precise tool.
What is the Cycling Zones & How does it work?
Cycling training intensity is commonly divided into zones that reflect the physiological stress of each effort. Power‑based zones are derived from the rider’s Functional Threshold Power (FTP), the highest average power a cyclist can sustain for about an hour. By staying within a specific zone, athletes can target endurance, tempo, threshold, or high‑intensity work, each producing distinct adaptations.
Power zones are calculated as percentages of FTP. For example, Zone 3 (Tempo) typically spans 75 %–90 % of FTP, while Zone 5 (VO₂max) covers 105 %–120 % of FTP. The exact boundaries are expressed with simple linear equations, allowing quick conversion from a rider’s FTP to concrete wattage ranges.
Heart‑rate zones complement power zones by using the Karvonen method, which scales effort based on the difference between maximum and resting heart rate. This dual‑approach lets cyclists who train without power meters still target appropriate intensities, while providing a cross‑check for those who use both metrics.
P_{3,low}=0.75\times FTP
P_{3,low} = lower bound of Zone 3 power (watts)
Parameters
Result
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Frequently Asked Questions
What is Functional Threshold Power (FTP) in cycling?
Functional Threshold Power is the highest average power a cyclist can sustain for about an hour, used to determine power zones.
How are cycling zones typically defined?
Cycling zones are defined as percentages of FTP, with Zone 3 (Tempo) usually ranging from 70-85% of FTP.
Why is it important to stay within specific power zones while cycling?
Staying within specific zones helps target different aspects of fitness, such as endurance or high-intensity work, leading to better adaptation and performance.
Can I use this calculator for any type of cycling?
Yes, the Cycling Zones Calculator is applicable for various types of cycling, including road, mountain, and time trials.
How often should I recalculate my power zones?
It’s recommended to recalculate your power zones every 4-6 weeks or whenever there are significant changes in fitness level.
What is the difference between Zone 2 and Zone 3 in cycling?
Zone 2 (Endurance) is typically 50-70% of FTP, while Zone 3 (Tempo) is 70-85% of FTP. Zone 3 focuses on maintaining a steady effort for longer periods.
Can this calculator help me improve my cycling performance?
Yes, by using the calculator to target specific zones during training, you can develop different aspects of your fitness and potentially improve overall cycling performance.
Results are for informational purposes only and do not constitute professional advice.