Cycling Power Labs Power Zones
Calculator

Analytics by www.CyclingPowerLab.com

Instructions:
Determine your Functional Threshold (FTP). Popular methods include a one hour field test (optimal definition) or a shorter 20 minute field test, dividing the average power by 1.05. Alternatively use other test durations and our Monod Critical Power model to estimate 60 minute power.
Power Models : Monod (Critical) Power Calculator