How To Find Your Heart Rate Zones
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Max heart rate
Heart-rate zones are the cleanest way to prescribe cardio intensity without relying on subjective effort. Knowing that Zone 2 is a different animal from Zone 4 lets you build a training week where easy days are actually easy and hard days are actually hard. Beginners usually push their easy runs too hard, which makes the hard days mediocre; using zones corrects that. The math is approximate — max heart rate varies by 10+ beats person to person — but even rough zones are better than running by feel alone. This guide covers the 220-age estimate, the more accurate Karvonen method, what happens physiologically in each zone, the lactate thresholds that anchor the system, and how to assign zones to your training days.
Measuring max for real
Zones are all percentages of max HR (or HR reserve), so the first job is estimating max.
Resting heart rate
The 220-age formula overestimates for younger adults and underestimates for older. Tanaka is slightly more accurate. All formulas have a standard error of ~10 bpm — your actual max could be anywhere in that range.
Percentage of max (simple zones)
The most accurate approach is a field test. After a thorough warm-up:
Karvonen method (HR reserve)
These tests hurt. Don’t do them cold, and don’t do them if you have unscreened cardiovascular risk factors. An exercise stress test with a clinician is the safe version.
What happens physiologically in each zone
Measure first thing in the morning, before getting out of bed, before coffee. Average across 3–5 days.
Lactate thresholds (LT1 and LT2)
Resting HR is a rough measure of fitness. Dropping 5–10 bpm over months of training is a good sign. Suddenly higher resting HR (10+ bpm above baseline) suggests fatigue, illness, or overtraining.
Training prescriptions by zone
Example for HRmax 180:
Heart-rate drift
The percentage-of-max approach ignores your resting HR, which varies a lot across fitness levels. The Karvonen formula uses HR reserve (HRR), which is more personalized.
Monitors and accuracy
Karvonen zones typically hit higher HR numbers than plain percentage-of-max for trained athletes, and they track effort more accurately.
Common mistakes
More precise than HR zones. Zones are a proxy; thresholds are the underlying physiology.
Run the numbers
Lab testing measures these precisely. Field estimates: LT2 HR is usually within a few beats of your average HR for a 60-minute race effort.