| What it does | Free Karvonen formula heart rate zone calculator
| Free calculators that run in your browser, with the formula next to the result
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| Stage | Established
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Free
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| Pricing | Not given
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| Key features | - Five personalized training zones based on heart rate reserve
- Accounts for resting heart rate and cardiovascular fitness
- Custom maximum heart rate input from multiple formulas
- No signup required, runs entirely in browser
- Weekly resting heart rate logging and progress tracking
- Zone-specific training guidance for different goals
- Shareable and printable zone results
- Embeddable calculator widget for websites
| - Real-time calculation results
- Formulas shown beside results
- Step-by-step explanations
- Browser-based with no installation required
- Expert-written blog guides
- Mobile-friendly design
- Keyboard navigation support
- 70+ calculators across 18 categories
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| What makes it different | - More accurate than age-only formulas, accounting for individual cardiovascular fitness
- Zones adapt as your fitness improves and resting heart rate drops
- Based on 1957 Karvonen research used by coaches and sports scientists
- Independent, no data collection or external servers
- No ads inside the calculator, free to use with optional embedding
| - No account sign-up or paywall required
- Calculations run instantly in your browser with no waiting
- Data stays on your device and is never stored or sold
- Every formula verified against trusted academic and industry sources
- Free forever with no premium tier
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 11 ▲ +1 (up) since last check | 6 ● no change since last check |
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| Trust Flow (Majestic) | 19 | 2 |
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| Citation Flow (Majestic) | 25 | 16 |
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| Referring domains (Majestic) | 40 | 31 |
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