Cat Age Calculator
Convert cat age into approximate human years
Birth date 🐈
🐈 How it works
Cats age faster than people, especially early on. The calculator finds calendar age from the birth date and maps it to approximate human years.
Use it as a care guide, not a biological fact — breed, health and lifestyle change aging speed.
📐 Formula
up to 4 years: age × 7; then: 28 + (age − 4) × 4
Age includes months (years + months/12), then rounds. Example: 3.5 years → ≈ 25 human years.
❓ FAQ
Is the human age exact?
No — it is an average estimate and ignores breed differences.
Does it work for kittens?
Yes: the first years use a factor of 7.
Can I use it for dogs?
No — dogs use a different scale. Use the dog age calculator.