For a 55-year-old, the Tanaka formula estimates a maximum heart rate of about 170 bpm. That puts your Zone 2 (easy aerobic) at roughly 102–119 bpm and your Zone 4 (threshold) at 136–153 bpm. Below you will find the full 5-zone table, a formula comparison, and a calculator that personalises the numbers if you enter your resting HR.
| Zone | Name | % HRmax | BPM (age 55) |
|---|---|---|---|
| 1 | Recovery | 50–60% | 85–102 |
| 2 | Endurance | 60–70% | 102–119 |
| 3 | Aerobic | 70–80% | 119–136 |
| 4 | Threshold | 80–90% | 136–153 |
| 5 | Maximum | 90–100% | 153–170 |
No single equation is authoritative. The spread below shows why picking a formula matters — the difference between Fox and Nes at your age moves your Zone 2 ceiling by several beats.
| Formula | HRmax at age 55 |
|---|---|
| Fox (220 − age) | 165 |
| Tanaka (208 − 0.7 × age) | 170 |
| Gellish (207 − 0.7 × age) | 169 |
| Nes / HUNT (211 − 0.64 × age) | 176 |
| Gulati (206 − 0.88 × age, women) | 158 |
Typical resting heart rate: 56–72 bpm.
Typical VO2max reference (good/very good): Men 32–37 ml/kg/min (good); women 27–32 ml/kg/min (good). Source: ACSM norms and HUNT Fitness Study.
Why HRmax sits where it does at 55: The Nes/HUNT formula (211 − 0.64 × age) tends to fit trained 55-year-olds better than Tanaka, because it accounts for the slower HRmax decline seen in active populations.
Three Zone 2 sessions of 40–50 minutes, one Zone 4 session (2×12 min), and two strength sessions. If you are on beta-blockers, use RPE 5–6/10 for Zone 2 and 7–8/10 for Zone 4.
Beta-blockers lower both resting HR and HRmax, often by 20–30 bpm. Percentage-based zones become unreliable. Talk to your cardiologist about using RPE, power, or pace instead.
Using the Tanaka formula (208 − 0.7 × age), the estimated maximum heart rate for a 55-year-old is about 170 bpm. Population variability is roughly ±10–12 bpm, so your true HRmax could sit anywhere between 160 and 180 bpm.
Zone 2 for a 55-year-old is approximately 102–119 bpm, which corresponds to 60–70% of an estimated HRmax of 170 bpm. You should be able to hold a full conversation at this intensity.
Zone 4 (lactate threshold) for a 55-year-old is roughly 136–153 bpm — 80–90% of HRmax. At this intensity you can only speak in short phrases.
Enter your resting heart rate into the calculator to apply the Karvonen method, which anchors zones to your heart rate reserve. This is significantly more accurate than %HRmax alone, especially if you are trained or untrained.
Beta-blockers lower both resting HR and HRmax, often by 20–30 bpm. Percentage-based zones become unreliable. Talk to your cardiologist about using RPE, power, or pace instead.
Disclaimer: This calculator is for informational purposes only and does not provide medical advice. Always consult with a healthcare professional before starting any new exercise program.
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