Cycling power zones let you train at precisely the right intensity by dividing your effort into seven levels based on your Functional Threshold Power (FTP). Whether you are building endurance on long rides, doing threshold intervals, or sprinting for a finish line, knowing your personal power zones ensures every pedal stroke counts toward your goals.
Estimate Your FTP
Enter your average power over a 20-minute all-out effort
How to Use the Cycling Power Zone Calculator
The cycling power zone calculator helps you determine your Functional Threshold Power (FTP), calculate your watts per kilogram ratio, and see all seven Coggan power training zones with personalized watt ranges. Whether you ride with a power meter on the road or train on a smart trainer indoors, power-based training is the most precise way to structure your cycling workouts.
Step 1: Choose Your FTP Test Type
Select the type of FTP test you performed using the toggle buttons. The 20-minute test is the gold standard: ride all-out for 20 minutes and the calculator applies a 95% factor. The 8-minute test uses a 90% factor, the ramp test takes 75% of your final one-minute power, and Direct FTP lets you enter a known FTP value directly if you already have one from a previous test or training app.
Step 2: Enter Your Test Power
Type the average power in watts from your test effort. For a 20-minute test, this is your average power over the full 20 minutes. For a ramp test, enter the average power of your final completed one-minute step. Make sure you test on fresh legs after a rest day for the most accurate result.
Step 3: Enter Your Body Weight
Input your body weight in pounds or kilograms to calculate your watts per kilogram (w/kg) ratio. This metric is the best way to compare cycling performance across riders of different sizes, especially for climbing. You can toggle between lbs and kg using the unit buttons.
Step 4: Review Your Power Zones
After clicking Calculate, you will see your FTP, w/kg ratio with a performance rating, and all seven Coggan power zones displayed as colored bars with watt ranges. Each zone card includes the percentage range, a description of the training effect, recommended duration, and example workouts suited to that zone. Zone 1 is easy recovery riding while Zone 7 covers maximal neuromuscular sprints.
Training with Power Zones
Most successful training plans follow a polarized model: roughly 80% of your riding time in Zone 1-2 (easy endurance) and 20% at higher intensities (Zone 4-6). Retest your FTP every 6-8 weeks as your fitness improves. As your FTP increases, your zones shift upward, ensuring your training remains appropriately challenging throughout the season.
FAQ
Is this cycling power zone calculator free?
Yes, this FTP and power zone calculator is completely free with no limits or signup required. All calculations run locally in your browser and no data is sent to any server.
Is my data safe and private?
Yes, all calculations happen entirely in your browser using client-side JavaScript. Your power and weight data is never sent to any server or stored remotely. Nothing is saved after you leave the page.
What is FTP in cycling?
FTP stands for Functional Threshold Power and represents the highest average power in watts that you can sustain for approximately one hour. It is the foundation for setting cycling training zones and is widely used by coaches and athletes to prescribe training intensity.
Which FTP test should I use?
The 20-minute test is the most popular and widely validated. Ride as hard as you can sustain for 20 minutes on a flat road or trainer, then multiply by 0.95. The 8-minute test is shorter but slightly less accurate. The ramp test is the easiest to execute and is built into most smart trainers.
What is a good watts per kg for cycling?
For recreational cyclists, 2.0 to 3.0 watts per kg is typical. Amateur racers usually produce 3.0 to 4.0 w/kg, competitive riders 4.0 to 5.0 w/kg, and elite or professional cyclists often exceed 5.0 to 6.0 w/kg. Your w/kg improves with both increased power and lower body weight.
How often should I retest my FTP?
Most coaches recommend retesting your FTP every 6 to 8 weeks to keep your training zones accurate. As your fitness improves, your FTP rises and your old zones become too easy. Regular retesting ensures your training stays challenging enough to produce gains.
What are Coggan power zones?
Coggan power zones are a 7-zone training system developed by exercise physiologist Dr. Andrew Coggan. Each zone is defined as a percentage range of your FTP, from Zone 1 (active recovery below 55% FTP) through Zone 7 (neuromuscular power above 150% FTP). They are the standard power-based training system used in cycling.
Can I use this calculator with a smart trainer?
Yes, smart trainers are ideal for FTP testing because they provide accurate, consistent power data. Most smart trainer apps like Zwift and TrainerRoad have built-in FTP tests, and you can enter the result directly into this calculator to see your full zone breakdown and watts per kg rating.