80/20 ZONE CALCULATOR Version 3

by Matt Fitzgerald and David Warden
Please only use this v3 calculator if your TrainingPeaks.com plan presents your workout segments in a zone range as opposed to a static zone upper limit. Otherwise, please default the v2 calculator. For details on determining LTHR, TP, CV, and FTP please see Intensity Guidelines for Triathlon and Running. You do not need an 80/20 training plan to utilize the calculator. For best results, frequent users of this calculator should clear browser cache to ensure the latest calculations have been loaded. Use the Reset button below to reset values or if calculations look wrong.