Are these zones medical advice?

No—consult a medical professional before starting new training.

Can I customize max HR?

Yes—override the formula with your lab-tested or wearable-derived max.

Estimate heart-rate zones for training.

Max HR method Zone calculation

Age (years) Resting HR (bpm) (optional) Zone scheme

Estimated Max HR

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Heart-Rate Reserve (HRR)

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HRR = Max HR − Resting HR (used by Karvonen)

Zone	Intensity	% Range	Target (bpm)

Calories estimator (uses MET)

Weight Duration (min) MET

Estimated calories

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Per minute

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Formula: kcal = MET × body-weight(kg) × time(hours). When using pounds, we convert to kg automatically.

Help & FAQ — Heart Rate Zones Calculator

Enter age and choose Fox, Tanaka or a custom maximum heart rate.
Choose % of Max HR or Karvonen and a zone scheme; Karvonen needs resting heart rate.
Review five zone ranges, then copy or share the summary.

Are these zones medical advice?: No—consult a medical professional before starting new training.
Can I customize max HR?: Yes—override the formula with your lab-tested or wearable-derived max.

The age field shows 10–100 years
Outputs five training zones; optional weight, duration and MET estimate calories
Results are estimates; individual training needs vary

Calculations run in your browser. Copy places the summary on your clipboard; Share sends the displayed results through your chosen app.

15 October 2025