🚴 Cycling Power Zone: Calculator

Turn your FTP into 7 training power zones, plus your watts-per-kilogram.

watts
kg
FTP
0 W
0.00 W/kg
Zone% of FTPWatts

How the Cycling Power Zone Calculator Works

Functional Threshold Power (FTP) is the highest average power, in watts, you can sustain for about one hour. Once you know your FTP — from a field test or a recent race effort — this calculator applies the widely used 7-zone power training model (popularized by Andrew Coggan) to break your training intensities into specific watt ranges.

Zone wattage = FTP × Zone % range
W/kg = FTP ÷ Body Weight (kg)

Why Train by Power Zones?

Unlike heart rate, power output responds instantly to effort, making it a more precise way to structure interval workouts, pace efforts, and track fitness improvements over time. As your FTP increases with training, your watt ranges for every zone increase proportionally, so it's worth re-testing your FTP every 6-8 weeks.

What Is W/kg and Why Does It Matter?

Watts per kilogram (W/kg) expresses your power output relative to your body weight, which is the key metric for climbing performance — a lighter rider producing the same wattage as a heavier rider will generally climb faster. It's commonly used to compare cyclists of different sizes on a level playing field.

📎 Related Tools: Cycling Calorie Calculator Target Heart Rate Calculator VO2 Max Calculator Pace Calculator

❓ Frequently Asked Questions

How do I find my FTP?
The most common methods are a 20-minute all-out time trial (multiply the average power by 0.95) or a ramp test done on a smart trainer or with a cycling coach. Many bike computers and training apps can also estimate FTP from ride data over time.
How often should I retest my FTP?
Most cyclists retest every 6-8 weeks during a structured training block, or after a notable jump in fitness, since training zones based on an outdated FTP become less accurate over time.
What's a good W/kg for a cyclist?
It varies enormously by rider category and goals — recreational riders are often in the 2-3 W/kg range, while competitive amateur racers are often 4-5+ W/kg, and professional climbers can exceed 6 W/kg. There's no single 'good' number; track your own trend over time.
Why does Zone 7 not have an upper limit?
Zone 7 (Neuromuscular Power) covers very short, maximal sprint efforts where the exact ceiling isn't meaningfully bounded by FTP-based percentages — these efforts are limited by short-term anaerobic capacity rather than threshold power.
Can I use this calculator for indoor trainer workouts?
Yes. Most smart trainers and training apps let you enter your FTP directly, and the same zone percentages shown here are used to structure interval workouts in watts.

🏆 About This Tool — Accuracy & Trust

🔒 Data Privacy: All calculations run entirely within your browser using JavaScript. Nothing you enter here is ever transmitted to our servers, stored, sold, or shared.

📐 Accuracy Note: This tool uses standard, widely published formulas and guidelines. Results are estimates for informational purposes; for financial, medical, or engineering decisions, consult a licensed professional.

📅 Last Updated: September 2026.