Pet Life Stage Calculator
Determine your pet life stage (puppy/kitten, adult, senior) based on type, size, and age.
Get tailored care tips for each stage.
Pet Life Stage
Pet life stages vary by species and size. Larger dogs age faster and reach senior status sooner than small dogs or cats.
Dog life stages by size:
| Stage | Small (<25 lbs) | Medium (25–55 lbs) | Large (55–80 lbs) | Giant (80+ lbs) |
|---|---|---|---|---|
| Puppy | 0–12 months | 0–12 months | 0–15 months | 0–18 months |
| Junior | 1–2 years | 1–2 years | 1–2 years | 1–2 years |
| Adult | 2–8 years | 2–7 years | 2–6 years | 2–5 years |
| Senior | 8–12 years | 7–10 years | 6–8 years | 5–7 years |
| Geriatric | 12+ years | 10+ years | 8+ years | 7+ years |
Cat life stages:
| Stage | Age |
|---|---|
| Kitten | 0–12 months |
| Junior | 1–2 years |
| Adult | 3–6 years |
| Mature | 7–10 years |
| Senior | 11–14 years |
| Geriatric | 15+ years |
Human age equivalents (approximate):
- 1-year-old dog ≈ 15 human years
- 2-year-old dog ≈ 24 human years
- After that: +4–7 human years per dog year (varies by size)
- 1-year-old cat ≈ 15 human years
- 2-year-old cat ≈ 24 human years
- After that: +4 human years per cat year
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.