Max heart rate
192bpm
Tanaka
220 − age
197bpm
classic
Zone 2
115–134bpm
aerobic base
Vigorous from
148bpm
about 77% of max
Show the math
Max HR = 208 − 0.7 × 23 = 192 bpm
Heart rate zones at 23
| Zone | BPM | % of max | Feels like |
|---|---|---|---|
| Zone 1 · Recovery | 96–115 | 50–60% | Easy, conversational |
| Zone 2 · Aerobic base | 115–134 | 60–70% | Steady, can still talk |
| Zone 3 · Tempo | 134–154 | 70–80% | Comfortably hard |
| Zone 4 · Threshold | 154–173 | 80–90% | Hard, short phrases |
| Zone 5 · Max effort | 173–192 | 90–100% | All-out, seconds to minutes |
Karvonen zones by resting heart rate
| Resting HR | Zone 1 | Zone 2 | Zone 3 | Zone 4 |
|---|---|---|---|---|
| Resting 55 | 123–137 | 137–151 | 151–165 | 165–178 |
| Resting 65 | 128–141 | 141–154 | 154–167 | 167–179 |
| Resting 75 | 133–145 | 145–157 | 157–169 | 169–180 |
Karvonen: resting + (max − resting) × intensity. More personal if you know your resting rate.
How to use it
- Enter your numbers. Switch between US and metric units at any time.
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These are estimates, not a diagnosis. A clinician can account for your health history and medicines.
Other ages
Common questions
What is a good heart rate zone for a 23-year-old?
Zone 2, about 115 to 134 bpm, builds aerobic base. Moderate exercise sits around 123 to 146 bpm.
What is the max heart rate at 23?
About 192 bpm by the Tanaka formula, or 197 by 220 minus age. Individual max can differ by 10 or more beats.