| What it does | Free online countdown timer with custom sounds, themes, and sharing
| Free Karvonen formula heart rate zone calculator
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| Stage | Not given
| 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 | - Custom duration and end time settings
- Multiple sound alert options
- Fullscreen mode for focused display
- Shareable timer links
- Keyboard shortcuts for quick control
- Mobile optimized responsive design
- Saved preferences between sessions
- Browser notifications
- Up to 24 hour timer duration
- Popular preset timers
| - 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
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| What makes it different | - Completely free with no hidden costs or premium features
- No registration or personal information required
- Privacy focused with no tracking or data collection
- Works on all devices without downloads or installations
- Shareable timer links for collaborative timing
| - 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
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 14 ▼ −1 (down) since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 18 | 19 |
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| Citation Flow (Majestic) | 21 | 25 |
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| Referring domains (Majestic) | 487 | 40 |
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Best Countdown
CalculateMyHeartRate