Dog Years to Human Years Chart (by Size)
Chart summary: Convert dog years to human years with a size-banded table, not ×7. Year 1 ≈ 12–15 human years; year 2 ≈ low-to-mid 20s; afterward small dogs add roughly ~4 human years per dog year while giant breeds add more. The table below (ages 1–16) matches our free calculator—educational estimates only.
Full size chart (approximate human years)
Generated from the same educational lookup used on the calculator. Values are rounded for display.
| Dog age | Small | Medium | Large | Giant |
|---|
Simple formula (educational)
- First year: ~15 (small/medium/large) or ~12 (giant)
- Second year: reaches ~22–24 depending on size
- Thereafter: add roughly 4 (small), 5 (medium), 5–6 (large), or ~7 (giant) human years per dog year—implemented via our lookup table
- AKC — How to Calculate Dog Years to Human Years
- AVMA — Pets Age Faster than People (PDF)
- AAHA Age Chart Poster (PDF)
FAQ
What is the dog years to human years chart used for?
It gives pet owners a rough sense of developmental stage—not a precise medical age or remaining lifespan.
Why do giant breeds show higher numbers later?
Educational charts often depict larger dogs aging faster after early adulthood, so later ages map to higher human-year equivalents.
Can I calculate a half year?
Yes—use the dog age calculator; it interpolates between whole years.
Is this veterinary advice?
No. Educational estimate only.
Not veterinary advice. Educational estimate only. Not a veterinary diagnosis or lifespan prediction. Formulas follow commonly published charts. Ask your veterinarian about your pet’s individual health.