Dog Age Calculator
Convert your dog's age to human years using the latest 2026 veterinary science formulas that account for breed size.
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Enter your dog's age
How It Works
The old "multiply by 7" rule is outdated. Modern veterinary research shows that dogs age rapidly in their first two years, then slow down. The rate also varies by size — larger dogs unfortunately age faster.
| First year | ~15 human years (all sizes) |
| Second year | ~9 human years (all sizes) |
| Each year after (small) | ~4 human years |
| Each year after (medium) | ~5 human years |
| Each year after (large) | ~6 human years |
Frequently Asked Questions
No, the multiply-by-7 rule is outdated and inaccurate. Modern research shows dogs age rapidly in their first two years and then slow down, with the rate varying by size.
Yes, small dogs tend to live longer and age more slowly after reaching maturity. Large and giant breeds age faster, with each year after age 2 equivalent to 5-6+ human years.
It depends on size: small breeds around 10-12 years, medium breeds at 8-10 years, large breeds at 7-8 years, and giant breeds as early as 5-6 years.