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Fitness Heart Rate Zone Calculator

Calculate heart rate training zones from age and resting HR. Get Zone 1-5 ranges for cardio and fat burn. Free online calculator with instant browser-based

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Inputs that matter
Age, Resting Heart Rate
Output to expect
Heart Rate Zone Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Maximum Heart Rate

The most common estimate uses age-based formula. Individual max HR varies ±10–15 bpm from the estimate.

Max HR = 220 − Age (alternative: 208 − 0.7 × Age for older adults)

Karvonen Heart Rate Reserve Method

More personalized than simple percentage of max HR. Uses resting HR to calculate training zones via heart rate reserve (HRR).

Target HR = ((Max HR − Resting HR) × Intensity %) + Resting HR

Clinical Formula Basis

The Heart Rate Zone Calculator uses peer-reviewed equations (WHO, Mifflin-St Jeor, Harris-Benedict, or domain-specific standards). Results are general wellness estimates, not medical diagnoses.

Metric = f(height, weight, age, activity, …)

Updated: July 2026

Example Scenarios

Calculating fat-burning Zone 2 range (60–70% HRR) for aerobic base training.

Age: 40Resting HR: 62 bpmZone: Zone 2 (60–70%)

→ Max HR: 180, Zone 2: ~133–145 bpm

Setting Zone 4–5 targets for high-intensity interval training sessions.

Age: 28Resting HR: 55 bpmZone: Zone 4–5 (80–100%)

→ Max HR: 192, Zone 4: ~165–174 bpm, Zone 5: ~174–192 bpm

A gym member records height and weight in the Heart Rate Zone Calculator to establish a baseline BMI and revisits monthly to track progress toward a goal.

Common Mistakes to Avoid

Using 220 − age as exact maximum heart rate

220 − age has ±10–15 bpm standard deviation. A 40-year-old's true max may be 165–195 bpm. Use field tests or lab tests for precision; formulas are starting estimates.

Training only in the 'fat burn zone'

Lower-intensity zones burn a higher fat percentage but fewer total calories. Higher zones burn more total fat grams due to greater calorie expenditure. Mix all zones for optimal fitness.

FAQ

Our Heart Rate Zone Calculator uses standard mathematical formulas to provide precise results. Enter your values and get instant, reliable output for everyday and professional use.

Yes, our Heart Rate Zone Calculator is completely free with no registration required. There are no usage limits, hidden fees, or account setup — just open the tool and calculate.

Yes, the Heart Rate Zone Calculator is fully responsive and works on all devices including phones, tablets, and desktops. All calculations run in your browser for fast, private results.

No. The Heart Rate Zone Calculator provides general wellness estimates based on standard equations, not a diagnosis or treatment plan. Consult a doctor, registered dietitian, or certified trainer for advice tailored to your health history.

Most health tools accept both metric (cm, kg) and imperial (ft/in, lb) inputs with automatic conversion. Select the unit system you prefer before entering measurements for consistent results.

About Fitness Heart Rate Zone Calculator

Use our free Heart Rate Zone Calculator for fast, accurate results in your browser. No signup or installation required — works on any device.