Cat Age Calculator
Find out how old your cat is in human years and which life stage it’s in.
Your result appears here.
By Shah Rukh, software developer · Last updated:
Cat years to human years
| Cat age | Human age | Life stage |
|---|---|---|
| 6 months | ≈ 8 | Kitten / Junior |
| 1 year | 15 | Junior |
| 2 years | 24 | Prime adult |
| 5 years | 36 | Prime adult |
| 8 years | 48 | Mature adult |
| 12 years | 64 | Senior |
| 15 years | 76 | Geriatric |
| 20 years | 96 | Geriatric |
The formula: the first year equals 15 human years, the second adds 9, and every year after adds about 4. Life stages follow the AAHA/AAFP feline life stage guidelines.
Indoor cats typically live 12–18 years, and many reach their 20s with good care. Got a dog too? Try the dog age calculator.
Frequently asked questions
How old is a 10-year-old cat in human years?
About 56 human years, a mature adult nearing senior age.
When is a cat a senior?
From around 11 years old; from 15 cats are considered geriatric (super-senior).
What was the oldest cat ever?
Creme Puff from Texas lived to 38 years and 3 days, according to Guinness World Records.
Related tools
Spin the Wheel
Random name picker wheel for giveaways and classrooms.
Flip a Coin
Heads or tails? Flip a fair coin online.
Random Number Generator
Random numbers in any range, with no repeats.
Yes or No Wheel
Can’t decide? Spin for a yes or no answer.
Typing Speed Test
Test your typing speed in WPM and accuracy.
Reaction Time Test
How fast are your reflexes? Click on green.