| What it does | Free dog age calculator and veterinary research-based pet tools
| Date, deadline and time calculators with visible assumptions and sources
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| US
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| Pricing model | Not given
| Free
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| Key features | - 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
| - 184 calculators across 53 categories
- Shows counting rules and assumptions with each result
- Local-first processing with no data sent to servers
- Holiday and weekend calendar selection
- Business day counting
- Date arithmetic (add or subtract days, weeks, months, years)
- Sleep cycle planner with NIH-based 80-100 minute cycles
- Time zone conversion with DST handling
- Save results as images or add to calendar
- Schengen visa 90/180 day rolling window auditing
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| What makes it different | - 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)
| - Shows the source and counting rule beside every answer
- No sign-up or account required to use any calculator
- All inputs stay in your browser for privacy
- Comprehensive coverage across 53 life and work categories
- Higher-risk calculators include prompts to verify with professionals
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 3 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 10 | 0 |
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| Citation Flow (Majestic) | 19 | 0 |
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| Referring domains (Majestic) | 12 | 0 |
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petcalc
CalcSpan