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Cardio • Training Zones

Heart Rate Zone Calculator

Calculate your 5 training heart-rate zones from age, with an optional resting heart rate for a more personalized Karvonen estimate.

5
Training Zones
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Why Use This Calculator?

  • ✓Classic 220−age and personalized Karvonen methods.
  • ✓Five clearly labeled training zones with bpm ranges.
  • ✓Useful for cardio, HIIT, and recovery-run planning.

On This Page

Heart Rate Zone Calculator Formula Quick Reference Key Terms Explained Where It's Used Worked Examples Tips & Mistakes FAQs

Heart Rate Zone Calculator

Leave at 0 to use the classic 220−age method instead of Karvonen.

About Heart Rate Zone Calculator

Training heart-rate zones translate effort level into a number you can watch on a chest strap or watch. The classic method estimates max heart rate from age alone; the Karvonen method also factors in your resting heart rate, giving a more personalized 'heart rate reserve' to work from.

Results

Estimated Max Heart Rate
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Method Used
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ZoneRange (bpm)

Summary

Enter values to see your results.

Heart Rate Zone Calculator Formula

Max Heart Rate (classic)

Max HR = 220 − Age

Heart Rate Reserve (Karvonen)

HRR = Max HR − Resting HR

Zone Target (Karvonen)

Target = (HRR × Zone %) + Resting HR

Zone Target (classic)

Target = Max HR × Zone %

Quick Reference

Zone% of Max HRPurpose
Zone 150–60%Recovery
Zone 260–70%Endurance / fat burning
Zone 370–80%Aerobic / tempo
Zone 480–90%Threshold
Zone 590–100%Max effort / VO2 max

Karvonen vs. Classic

Karvonen accounts for fitness level via resting heart rate, so two people with the same age can get different zones.

Important Note

Formulas here are population estimates. If you're on heart medication or have a cardiac condition, use a clinically measured max heart rate instead.

Key Terms Explained

Heart-rate training uses percentages of a reference number to define effort bands you can pace by, without needing a lab VO2 max test.

💓 Max Heart Rate

  • The highest heart rate you can safely reach during exertion.
  • Commonly estimated as 220 minus age.
  • Individual variation can be ±10-15 bpm from the formula.

🔋 Heart Rate Reserve

  • Max HR minus resting HR.
  • Represents your usable 'range' of heart rate.
  • Used by the Karvonen method for personalized zones.

🧮 Karvonen Method

  • Factors in resting heart rate for a fitness-adjusted zone.
  • Generally considered more accurate than percent-of-max alone.
  • Requires a rested, accurate resting HR measurement.

🏋️ Training Zone

  • A target heart-rate band tied to a specific training purpose.
  • Zone 2 builds aerobic base; Zone 5 builds top-end speed.
  • Most training plans mix zones across the week.

Where It's Used

🔥 Fat-Burning Cardio

Stay in Zone 2 for longer, lower-intensity aerobic sessions.

⚡ HIIT & Intervals

Push into Zone 4-5 for short, high-intensity intervals.

😌 Active Recovery

Keep easy days in Zone 1 so hard days stay hard.

🏃 Endurance Base Building

Build aerobic base largely in Zone 2-3 for marathon training.

🧑‍⚕️ Cardiac Rehab Guidance

A starting reference for supervised rehab programs (consult a physician).

⌚ Wearable Zone Alerts

Set watch/app alerts to stay in a target zone during a workout.

Worked Examples

Example 1 — Classic Method

Age 30 → Max HR 190 bpm. Zone 2 (60-70%) = 114-133 bpm.

Example 2 — Karvonen Method

Age 30, resting HR 60 → HRR 130. Zone 2 target = 138-151 bpm.

Example 3 — Older Athlete

Age 55, resting HR 55 → Max HR 165, HRR 110, Zone 4 = 143-154 bpm.

Best Practices & Common Mistakes

✅ Best Practices

  • Measure resting heart rate first thing in the morning, before getting up.
  • Use Karvonen if you know your resting HR — it's more personalized.
  • Retest resting heart rate periodically as fitness improves.
  • Match zone to purpose: easy days low, hard days high.
  • Use a chest strap for more accurate readings than wrist sensors during intervals.

❌ Common Mistakes

  • Assuming everyone your age has an identical max heart rate.
  • Training in Zone 4-5 every session, which limits recovery.
  • Using a resting HR measured after caffeine or exercise.
  • Ignoring medication effects (e.g. beta blockers) on heart rate.
  • Chasing a specific zone number instead of perceived effort when the formula clearly feels off.

Frequently Asked Questions

It's a population average with a fairly wide error margin (±10-15 bpm for any individual). It's a reasonable starting point, not a precise measurement.
It calculates target heart rate as a percentage of your heart rate reserve (max HR minus resting HR) rather than a percentage of max HR alone, which better reflects individual fitness.
Most endurance plans spend the majority of weekly volume in Zone 2, with smaller amounts of higher-intensity Zone 4-5 work.
Yes, especially if you have a heart condition, take heart-rate-affecting medication, or are new to structured exercise.

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