Heart Rate Zone Calculator
Calculate your max heart rate and 5 training zones from age and resting heart rate (Karvonen). Free.
✓ 100% free ✓ No sign up ✓ Runs in your browser — nothing uploaded
Max heart rate
187 bpm
Zone 1 · recovery (50–60%) 126–138 bpm
Zone 2 · fat burn (60–70%) 138–150 bpm
Zone 3 · aerobic (70–80%) 150–163 bpm
Zone 4 · threshold (80–90%) 163–175 bpm
Zone 5 · max (90–100%) 175–187 bpm
How to use Heart Rate Zone Calculator
- 1Enter your numbers or dates.
- 2Results update instantly as you type.
- 3Copy the main result with one click.
Questions
Is Heart Rate Zone Calculator free?
Yes. Heart Rate Zone Calculator is 100% free with no limits, no watermark, no sign up and no email required.
Is my data sent anywhere?
No. Everything is calculated locally in your browser. Nothing you type is sent to or stored on any server.
Does Heart Rate Zone Calculator work on my phone?
Yes. Heart Rate Zone Calculator works in any modern browser on iPhone, Android, Windows, Mac, Linux and Chromebook. No app or install needed.
Do I need to create an account?
Never. There is no sign up, no login, no email and no paywall. Just open the page and use it.
How accurate is it?
Calculations use standard formulas with full floating-point precision. For medical, legal or financial decisions, please confirm with a professional.