Calculate your clients' maximum heart rate using the most accurate formulas and generate personalized training zones. Includes Tanaka, Gulati (women), HUNT (fitness-adjusted), and Karvonen.
Exercise 2–3 days per week
For Karvonen zones
The classic formula (220 - age) is imprecise. Tanaka is better for the general population, Gulati is specific to women, and HUNT accounts for your fitness level. Add your resting heart rate to get personalized Karvonen zones.
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Maximum heart rate (MHR or HRmax) is the highest number of beats per minute your heart can achieve during maximal physical effort. It is a key physiological marker used by coaches to define personalized training zones, set intensity targets, and monitor cardiovascular fitness over time.
Unlike resting heart rate, which improves with training, max HR is largely determined by age and genetics. It typically decreases by about 1 bpm per year after early adulthood. Knowing it accurately — rather than relying on rough estimates — allows you to prescribe efforts that are truly appropriate for each client.
| Formula | Equation | Best for |
|---|---|---|
| Classic | 220 - age | Quick reference only |
| Tanaka (2001) | 208 - (0.7 × age) | General population, men |
| Gulati (2010) | 206 - (0.88 × age) | Adult women |
| HUNT (2012) | 211 - (0.64 × age) ± adjustment | Athletes & active individuals |
Once you know a client's max HR, you can divide their cardiovascular capacity into five zones, each triggering different physiological adaptations. Zone 2 (60–70%) builds the aerobic base and teaches the body to burn fat efficiently. Zone 4 (80–90%) pushes the lactate threshold, improving sustained performance. Zone 5 (90–100%) trains peak power for short explosive efforts.
Research consistently shows that the most effective programs for endurance and body composition follow a polarized distribution: roughly 80% of sessions at low intensity (Zones 1–2) and 20% at high intensity (Zones 4–5), with minimal time in the middle “gray zone.” Heart rate zones give you the framework to apply this structure consistently across different clients and exercise modalities.