Zone Pro: HR Power Pace

Zone Pro is a unified training zone calculator for triathletes and endurance athletes, built around the methods coaches actually use.

Heart rate zones:

- Karvonen method (percent heart rate reserve) from your max and resting heart rate

- LTHR-based 6-zone model from your lactate threshold heart rate

Cycling power zones:

- Classic Coggan 7-zone model from your FTP (Functional Threshold Power)

Running pace zones:

- 5-zone model calculated from your threshold pace, in min/km or min/mile

Swim CSS zones:

- Critical Swim Speed from a 400m or 200m time trial, converted into pace-per-100m training zones

Enter your test numbers once and see every zone, for every discipline, laid out clearly with exact ranges, not vague guesses. Switch calculation methods to match what your coach or training plan uses.

Zone Pro works entirely offline and keeps your data on your device. No account, no subscription, no ads.

This app performs standard, published training-zone calculations for educational and training-planning purposes. It is not a medical device and does not replace advice from a coach or physician.