80/20 Zone Calculator

If you have one of our convenient 80/20 Endurance Training Plans, your custom training zones are auto-calculated directly within each workout. Otherwise, use this calculator to identify your individual intensity zones. For details on determining LTHR, TP, CV, and FTP and for the definition of each zone, please see Intensity Guidelines for Triathlon and Running. You don't need an 80/20 training plan or TrainingPeaks account to utilize the calculator. Consider using the 80/20 Zones Garmin app to increase your workout efficiency. When using a smartphone or tablet, this calculator performs best in landscape mode.

Copyright © 2018 Matt Fitzgerald and David Warden. All rights reserved. The formulas and zones provided on this site, in electronic or written form, are subject to copyright and are provided for personal use only. Distribution, modification, replication or adaptation for commercial use without explicit consent is prohibited.