ffee
All tools
Cycling Power Calculator
Enter your watts, body weight and ride time to get watts per kilogram, a power category and your training zones.
Analyse your cycling power
Watts per kilogram: — · Category: —
Estimated FTP: — · Relative FTP: —
Zones are built from the estimated functional threshold power.
How to use the Cycling Power Calculator
- Enter your average power in watts and your body weight in kilograms.
- Add the length of the ride and choose your sex for the category bands.
- Read your watts per kilogram, estimated FTP and the seven training zones.
Features
- Watts per kilogram from power and weight
- Power to weight category bands
- Estimated FTP from ride duration
- Seven training zones with watt ranges
Advertisement
Frequently Asked Questions
Common questions about the free online cycling power calculator.
It is your power output divided by your body weight. Cyclists use it to compare riders of
different sizes on climbs and over long efforts.
The calculator compares your watts per kilogram with standard category bands, adjusted for
the length of the effort and your sex.
The calculator scales your average power for the ride length. A twenty minute effort is close
to FTP, while a two hour ride is scaled down.
They run from zone one for active recovery up to zone seven for neuromuscular sprints, each
defined as a percentage of your FTP.
Functional threshold power is the highest power you can hold for about an hour, so it makes a
personal and repeatable anchor for training.
For an hour effort, around 2.5 W/kg is a fair amateur figure, 4 W/kg is very good and above 5
W/kg is close to elite racing.
Yes. Click Copy zones to place the watts per kilogram, FTP and all seven zones on your
clipboard for your training notes.
No. Every calculation happens in your browser, so your power, weight and ride length stay on
your own device.
Yes. The calculator is fully responsive and works in any modern browser on desktop, tablet
and phone.
Last updated: October 10, 2026