Training toolbox
Simple calculators for zone-based training decisions.
Reusable tools that support the guide library and standalone training workflows. Start with a calculator, then use the app to compare the result with real workout data.
Heart rateZone trainingArticle-ready tools
Training calculators
Heart Rate Zone Calculator
Estimate five training zones from a known max heart rate, an age-based max estimate, or heart-rate reserve.
Heart rateZonesEndurance
Training calculators
Zone 2 Heart Rate Calculator
Estimate a practical Zone 2 heart-rate range from age, resting heart rate, and an optional tested max heart rate.
Zone 2Heart rateAerobic base