| What it does | Free, real-time converter for tons to kilograms with exact SI constants
| Free Karvonen formula heart rate zone calculator
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| Stage | Not given
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| Founded | Not given
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| Pricing model | Free
| Free
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| Pricing | 100% free, no signup required
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| Key features | - Real-time conversion as you type
- Supports three ton types: metric, US short, and UK long
- Displays exact conversion constant with every result
- No signup, no account required
- Bidirectional conversion toggle between tons and kilograms
| - 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 | - Uses exact SI conversion constants rather than rounded approximations
- All calculations run client-side with no server calls or data storage
- Defaults to metric ton, the international standard
- Completely transparent methodology
| - 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) | 6 ● no change since last check | 11 ● no change since last check |
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| Trust Flow (Majestic) | 17 | 19 |
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| Citation Flow (Majestic) | 7 | 25 |
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| Referring domains (Majestic) | 25 | 40 |
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Ton to Kg
CalculateMyHeartRate