Age CalculatorYTScript

Cat Age Calculator

Enter your cat’s birthday or the years already lived to see a rough equivalent in human years. This is an estimate, not a veterinary opinion.

Runs in your browser — dates never leave this device
How do you want to enter age?
Date of birth
Age at the date of
Age will show up here Enter a date of birth. You can change the “age at” date if you want a day other than today.

How to use it

  1. 1

    Enter a birthday, or the years and months already lived.

  2. 2

    Read the estimate and the disclaimer.

  3. 3

    The ×7 figure is shown only as a contrast, not as the default.

How this calculator counts age

The numbers follow a widely published feline life-stage chart associated with the AAFP–AAHA Feline Life Stage Guidelines: about 15 human years in the first year, 24 by the end of the second, then about four human years for each year after that (so a 3-year-old cat is about 28 in human years).

Individual cats vary. This is not a health assessment and it does not predict lifespan.

Other date tools

Age calculatorExact age in years, months, and daysChronological age calculatorAge on an assessment date, with Y;M;D copyBaby age calculatorWeeks, calendar months, and days after birthDog age calculatorA size-based estimate in human yearsDays between datesCount days, with or without the end dateAdd or subtract daysMove a date by years, months, weeks, or daysDay of the week calculatorWeekday, day of year, and ISO week

Questions

What formula do you use?

15 human years for year 1, 24 for year 2, then 4 human years per year after that, matching the AAFP–AAHA feline life-stage chart often reprinted for pet owners. Part years are interpolated.

Is this the same as the dog calculator?

No. Cats have their own chart, so this page keeps its own title and numbers. The ×7 myth is shown as a contrast here too.

Is this veterinary advice?

No. It is a rough estimate from a public chart, not a diagnosis or a lifespan promise.