Is Heart Rate Zone Calculator free?

Yes, completely free. No registration required.

How is max heart rate calculated?

Standard formula: 220 - age. For athletes: 206.9 - (0.67 × age). The calculator supports both methods.

What is the Karvonen formula?

Karvonen (heart rate reserve) method: Target HR = Resting HR + Intensity% × (Max HR - Resting HR). It's more personalized than the simple percentage method.

What are the 5 heart rate zones?

Zone1(50-60%): Warm-up/Recovery. Zone2(60-70%): Fat burn, long slow distance. Zone3(70-80%): Aerobic, cardio fitness. Zone4(80-90%): Anaerobic threshold, high intensity. Zone5(90-100%): Max effort, sprint intervals.

Does this calculator upload my data?

No. All calculations are done locally in your browser. No data is uploaded.

How do I measure resting heart rate?

Measure first thing in the morning before getting out of bed. Sit still and count your pulse for 60 seconds. Normal range: 60-100 bpm for adults, 40-60 bpm for athletes.

Free Online Heart Rate Zone Calculator

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Updated: 2026-07-11

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How to Use

Enter your age and resting heart rate. Choose the calculation method (Karvonen recommended) and max HR formula. The tool shows 5 training zones with a visual bar chart.

❤️ Heart Rate Zone Calculator

How to Use