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Oct 18, 2026

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Heart Rate Zones Calculator

Estimate five exercise heart-rate zones using a measured maximum heart rate or an age-based maximum-heart-rate estimate.

Estimate Your Training Zones

Age-based heart-rate formulas describe population averages and can differ substantially from an individual's measured maximum. Heart conditions and medications can also change an appropriate exercise heart rate.

What Are the Five Heart Rate Zones?

Heart rate zones split your effort into five bands, each a percentage of your maximum heart rate (MHR). Different zones stress different energy systems, which is why structured training targets them deliberately:

Zone% of Max HRFeels LikeBest For
Zone 1 — Recovery50–60%Very easy, fully conversationalWarm-ups, active recovery
Zone 2 — Aerobic base60–70%Easy, can talk in full sentencesFat metabolism, endurance base
Zone 3 — Tempo70–80%Moderate, talking gets harderCardiovascular fitness, sustained efforts
Zone 4 — Threshold80–90%Hard, short phrases onlySpeed, lactate threshold
Zone 5 — Maximum90–100%All-out effortShort intervals, peak power

How the Zones Are Calculated

Each zone is a percentage band of your maximum heart rate. If you know your true measured max — from a lab test or an all-out field effort — enter it above for the most accurate zones. Otherwise the calculator estimates MHR from your age with the classic 220 − age formula.

Example: age 30 → estimated MHR ≈ 190 bpm → Zone 2 = 60–70% = 114–133 bpm

Age-based estimates describe population averages and can be off by 10–15 bpm for any individual, so treat them as a starting point. A measured maximum is always preferable for serious training.

How to Use Your Zones

  • Do most of your easy cardio in Zone 2 — it builds aerobic fitness with minimal fatigue and recovery cost.
  • Use Zones 4–5 sparingly, typically 1–2 sessions per week, for speed and VO2 max development.
  • Keep easy days easy: drifting into Zone 3 on every run is the most common training mistake and stalls progress.

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Frequently Asked Questions

Zone 2 burns the highest percentage of calories from fat, but higher zones burn more total calories per minute. For fat loss, total energy balance matters far more than the zone — Zone 2's real advantage is that you can sustain it for long sessions without exhausting yourself.

They describe population averages and can miss an individual's true maximum by 10–15 bpm in either direction. That is enough to put you a full zone off. If you train seriously, get a measured maximum from a hard field effort or lab test and enter it above.

Zone 2 training means long, easy sessions at 60–70% of max heart rate. It builds mitochondrial density and fat-burning capacity with very low recovery cost, letting endurance athletes stack high volume. Most of a well-structured training week — often 80% — happens here. Our Zone 2 guide covers it in depth.

Yes. Beta blockers and some other cardiac medications blunt heart rate, making percentage-based zones misleading — you may be working hard at a surprisingly low pulse. If you take heart or blood pressure medication, set training intensity with your doctor, not a formula.

Not at first. Beginners improve with almost any consistent activity, and perceived effort (the "talk test") works fine. Zones become useful once you are training 4+ hours a week and want easy days to stay genuinely easy and hard days genuinely hard.

Sources: zone definitions follow standard exercise-physiology practice; see the American Heart Association's target heart rate guidance.

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Maintained by Live Fitness Check. Last updated: August 13, 2026. How we test our calculators .

About This Calculator

The Heart Rate Zones Calculator divides a maximum heart rate into five simple percentage bands so you can visualize how exercise intensity changes across a workout. You can enter a measured maximum heart rate or allow the calculator to create an age-based estimate.

Methodology

If no measured maximum is entered, the calculator uses the Tanaka age-predicted equation HRmax = 208 − 0.7 × age. It then displays five bands at 50–60%, 60–70%, 70–80%, 80–90% and 90–100% of the maximum heart rate used. These are broad training bands rather than individualized clinical prescriptions.

Sources

Tanaka H, Monahan KD, Seals DR — Age-predicted maximal heart rate revisited: https://pubmed.ncbi.nlm.nih.gov/11153730/
American Heart Association — Target Heart Rates Chart: https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates
Disclaimer
Age-predicted maximum heart rate is an average estimate and individual values can differ substantially. Medications and cardiovascular conditions can alter exercise heart rate. Ask a qualified health professional about appropriate exercise intensity when medical factors apply.

Frequently Asked Questions

How is maximum heart rate estimated?

When you do not enter a measured maximum, this calculator uses the Tanaka equation: 208 minus 0.7 times age.

Are heart-rate zones exact?

No. Percentage zones are practical training guides, while individual physiology, medications and the accuracy of the maximum-heart-rate value affect the result.

Can I enter my own maximum heart rate?

Yes. If you have a responsibly measured maximum heart rate, entering it bypasses the age-predicted estimate.

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