Heart Rate Zones

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Estimate max heart rate and training zones for fat burn and cardio.

Estimated max HR
190 bpm

Karvonen zones from 220 − age.

Zone 1 (recovery)125–138 bpm
Zone 2 (fat burn)138–151 bpm
Zone 3 (aerobic)151–164 bpm
Zone 4 (threshold)164–177 bpm
Zone 5 (max)177–190 bpm

Steps

  1. Enter age (and resting HR optional)
  2. See max HR
  3. Read zone ranges

Related

Zone formulas are approximate. Stop exercise and seek care if you feel unwell.

FAQ

Are results official?

No—quick estimates only.

Is data saved?

No. Calculations run in your browser.