| What it does | Free Karvonen formula heart rate zone calculator
| Free calendars to print, save as PDF, or download in Excel format
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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
| - Add personal notes to dates
- US holidays and observances
- Download PDF templates
- Export and import notes as JSON
- Multiple paper sizes and orientations
- Sunday and Monday week start options
- Staff Calendar for team scheduling
- Excel workbooks with monthly worksheets
- Calendar Maker with custom settings
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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 or sign-up required
- Notes stored locally in browser, not online
- Multiple calendar formats available
- Covers years 2025 through 2030
- Print with visible notes and holidays included
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| Community votes | 0 | 0 |
| DR (Domain Rating by Ahrefs) | 11 ● no change since last check | Not checked yet ● no change since last check |
| Trust Flow (Majestic) | 19 | 0 |
| Citation Flow (Majestic) | 25 | 6 |
| Referring domains (Majestic) | 40 | 5 |