| What it does | Free Karvonen formula heart rate zone calculator
| Free dog age calculator and veterinary research-based pet tools
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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
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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
| - Dog age conversion by size (small, medium, large, giant breeds)
- AKC chart showing human-year equivalents
- DNA formula comparison (UC San Diego 16 × ln(age) + 31)
- Life stage identification (puppy, young adult, mature adult, senior, end of life)
- Dog lifespan by breed tool
- Puppy weight calculator
- Dog food calculator
- Dog calorie calculator
- Dog pregnancy calculator
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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
| - Research-based: built on peer-reviewed studies and veterinary guidelines from AAHA and AVMA
- Independent and transparent with no brand sponsorship or bias
- Mobile-friendly design that works on phones
- Multiple calculation methods shown for comparison (AKC chart and DNA formula)
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 11 ● no change since last check | 3 ● no change since last check |
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| Trust Flow (Majestic) | 19 | 10 |
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| Citation Flow (Majestic) | 25 | 19 |
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| Referring domains (Majestic) | 40 | 12 |
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CalculateMyHeartRate
petcalc