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HR Zones

Karvonen training zones

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Max HR
190 bpm
Z1 Recovery125-138
Z2 Aerobic138-151
Z3 Tempo151-164
Z4 Threshold164-177
Z5 VO2 Max177-190
◆ How it works

HR Zones3 simple steps

01

Age

Years

02

Resting HR

On waking

◆ FAQ

Common questions.

Best zone?

+

Frequently Asked Questions

20 questions answered · Tap to expand

Questions in English

Open Toolzfy Heart Rate Zones Calculator, enter the required input values, and see the 5 training zones (recovery, fat burn, aerobic, anaerobic, max) with BPM ranges based on age instantly. No signup, no email, no medical professional required for basic results. Works in any browser on desktop, Android, iPhone, or tablet. Free forever with no hidden costs or daily limits.

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Frequently Asked Questions

Common questions about Heart Rate Zones

Use the tool interface to input your data, get instant results. Simple and intuitive design.