GlenCalc

Cycling power calculator

FTP is roughly the power you can hold for an hour. Power-to-weight matters most on climbs.

Your answer

Power to weight3.34 W/kg
Power zones (% of FTP)
Zone% of FTPWatts
Z1 Active recovery0–55%0–138 W
Z2 Endurance56–75%140–188 W
Z3 Tempo76–90%190–225 W
Z4 Threshold91–105%228–263 W
Z5 VO2 max106–120%265–300 W
Z6 Anaerobic121–150%303–375 W

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How we worked it out

Updated as you change the numbers.

  1. W/kg = FTP ÷ body weight in kg. Zones are percentages of FTP (Coggan).

Method and assumptions

These are the widely used Coggan power zones. Recreational riders often sit around 2 to 3 W/kg; strong amateurs 3.5 to 4.5.

Questions

What is 250 W FTP at 165 lb in W/kg?

3.34 W/kg.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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