| What it does | Free Karvonen formula heart rate zone calculator
| Free browser tools for PDF, image and UK money tasks that process files locally
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| Stage | Established
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| Founded | Not given
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| Based in | Not given
| GB
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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
| - PDF merging and splitting
- Image conversion between HEIC, JPEG, PNG and WebP
- UK take-home pay calculator with income tax and National Insurance
- Stamp duty calculator for England and Northern Ireland
- Size converters for clothing, shoes, bra and ring sizes
- VAT, mortgage and loan calculators
- All tools run locally in the browser without uploading files
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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
| - All file processing and calculations run in your browser with no uploads to servers
- UK tax calculators use official rates from HMRC and GOV.UK reviewed after each Budget
- Covers Scottish and Welsh tax rules separately with clear documentation
- No accounts or contact forms required
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 11 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 19 | 0 |
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| Citation Flow (Majestic) | 25 | 17 |
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| Referring domains (Majestic) | 40 | 3 |
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CalculateMyHeartRate
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