Target Heart Rate Zone Calculator

Calculate personalized Karvonen cardiovascular exercise heart rate training zones for fat burning and cardio.

  • 100% free
  • Private in browser
  • No signup
  • No watermarks
Max Heart Rate
190 BPM
Heart Rate Reserve (HRR)
125 BPM
Zone 1: Recovery / Warm-Up (50-60%)
Active recovery, light walking, warm-up.
128 - 140 BPM
Zone 2: Aerobic Base / Fat Burn (60-70%)
Conversational endurance pace, maximum fat oxidation.
140 - 153 BPM
Zone 3: Tempo / Aerobic Fitness (70-80%)
Improves cardiovascular efficiency, moderate sweat.
153 - 165 BPM
Zone 4: Threshold / Anaerobic (80-90%)
Lactate threshold, hard breathing, high performance.
165 - 178 BPM
Zone 5: VO2 Max / Maximum Sprint (90-100%)
All-out bursts, sprint intervals (HIIT).
178 - 190 BPM

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About Target Heart Rate Zone Calculator

Calculate personalized Karvonen cardiovascular exercise heart rate training zones for fat burning and cardio. Use this free client-side tool on TheToolss with zero installation and complete privacy.

How to use Target Heart Rate Zone Calculator

  1. Open the tool in your browser
  2. Configure inputs and options
  3. View live preview and copy result

Key features

  • 100% free client-side tool
  • Fast instant results in browser
  • Zero tracking or data storage
  • Modern responsive UI

Frequently asked questions

Is this Target Heart Rate Zone Calculator free to use?
Yes, 100% free with unlimited usage and zero ads.
Is my data secure?
Yes, all processing happens entirely inside your browser client memory.
Does this tool work on mobile devices?
Yes, fully optimized for both desktop and mobile web browsers.
Can I export or copy results?
Yes, you can copy or download output with one click.
Do I need an account to use this tool?
No registration or account creation is required.