Dog Age Calculator
Convert dog age and human age using age and size, then see the corresponding life stage.
Did You Know?
Cats age rapidly in their first 2 years—a 2-year-old cat is like a 24-year-old human!
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Fill in your cat's information
Ready to Calculate?
Enter your cat's years and months to see the equivalent human age.
These are the fast lookups people usually need after searching for cat years, feline age calculator, or cat lifespan calculator.
Enter your cat's age above for the full estimate, or use the chart below for common ages from kitten stage through senior years.
Switch the calculator direction to estimate cat years from a human age with the same reversible formula.
Most indoor cats commonly live into their mid-to-late teens, while outdoor risk can shorten expected lifespan.
A six-month kitten is roughly 10 in human years, while a one-year-old cat is already close to 15 in human years.
Use this cat age chart and cat years to human years chart as a quick reference after the calculator. Cats mature quickly in the first two years, then each additional cat year is roughly four human years.
| Cat age | Human age |
|---|---|
| 1 month | 1 year |
| 3 months | 4 years |
| 6 months | 10 years |
| 1 year | 15 years |
| 2 years | 24 years |
| 3 years | 28 years |
| 4 years | 32 years |
| 5 years | 36 years |
| 6 years | 40 years |
| 7 years | 44 years |
| 8 years | 48 years |
| 9 years | 52 years |
| 10 years | 56 years |
| 11 years | 60 years |
| 12 years | 64 years |
| 13 years | 68 years |
| 14 years | 72 years |
| 15 years | 76 years |
| 16 years | 80 years |
| 17 years | 84 years |
| 18 years | 88 years |
| 19 years | 92 years |
| 20 years | 96 years |
Cats age much faster than humans in their first two years of life. A one-year-old cat is roughly equivalent to a 15-year-old human, while a two-year-old cat is about 24 in human years. After that, each cat year equals approximately 4 human years.
Method note: this calculator uses the common veterinary conversion model of 15 human years for the first cat year, 24 human years by age two, then about four human years per additional cat year. Life-stage guidance is aligned with the 2021 AAHA/AAFP feline life-stage framework. Read the AAHA life-stage definitions.
Live longer (15-20 years average). Protected from accidents and diseases.
Shorter average lifespan (10-15 years). More exposure to risks.
The oldest cat on record lived 38 years (about 168 human years)!
| Stage | Cat Age | Human Equivalent | What to Expect |
|---|---|---|---|
| Kitten | 0-6 months | 0-10 years | Rapid growth, high energy, learning |
| Junior | 7 months - 2 years | 12-24 years | Adolescence, playful, developing personality |
| Prime | 3-6 years | 28-40 years | Peak physical condition, settled behavior |
| Mature | 7-10 years | 44-56 years | Less active, may gain weight |
| Senior | 11-14 years | 60-72 years | Slower pace, more sleep, health monitoring |
| Super Senior | 15+ years | 76+ years | Special care needed, quality time priority |
The number is useful because it gives context. A three-year-old cat needs a different routine than a twelve-year-old senior cat, and the result can also become a small keepsake worth sharing.
Use the human-age result for a birthday caption, adoption anniversary, or profile card.
Use the life stage as a conversation starter for food, dental care, mobility, and vet checkups.
Turn the age result into a birthday portrait, senior cat keepsake, or ID-style photo.
Continue with a relevant free utility or move into a pet photo creation task.