Dog Age Calculator
Convert dog years to human years using a size-aware age model, with life-stage guidance and a chart for toy, small, medium, large and giant dogs.
Beagle, Corgi, Cocker Spaniel
Dog years to human years
English dog age calculators now usually explain that the old multiply-by-seven shortcut is too rough. Dogs mature quickly early in life, and adult aging differs by size and breed.
H is the human-age comparison from the Wang et al. epigenetic-clock model. D is dog age in years. The tool also applies a practical size-category adjustment for comparison.
Why size matters
| Size | Typical weight | Why it matters |
|---|---|---|
| Toy / small | Up to about 20 lb | Often longer-lived, with a slower senior transition. |
| Medium | About 21 to 50 lb | A middle baseline for broad dog-age comparisons. |
| Large | About 51 to 90 lb | Often reaches senior care discussions earlier. |
| Giant | Over 90 lb | Typically shorter average lifespan and faster late-life aging. |
Frequently Asked Questions
Sources and References
- Calculating Your Dog's AgeUC Davis School of Veterinary Medicine
- NHGRI researchers reframe dog-to-human aging comparisonsNational Human Genome Research Institute
- 2019 AAHA Canine Life Stage GuidelinesAAHA
- Dog Age CalculatorDog Calculator
Calculations are based on the listed reference sources. Links open in a new tab.
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