Cat Age Calculator

Leave the birth date blank to use this. Fractions are fine - 0.5 is six months.
If given, the age is measured from this date and the years/months boxes are ignored.
The date the age is measured on. Leave blank to use the current date supplied by the page.
Human-equivalent age
36.0 years
Dog and Cat Age Calculator
Age used
5.000 years
Age in months
60.0 months
Life stage of the human-equivalent age
Young adult
Human years gained per pet year now
4.00 years
Reaches human-equivalent 65 at
12.25 years
Model used
AAHA / AAFP / International Cat Care staged feline model
Size band used
Not applicable to cats
Age taken from
age entered directly
Summary
A 5-year-old cat is about 36 in human years (young adult).
Worked out from American Veterinary Medical Association, "How old is my pet in human years?" guideline as published in the AKC dog-age conversion chart and 2 other sources.
Age conversion is a rough population guide, not a health assessment. Life stage, senior screening and any change in care should be decided by a veterinarian who has examined the animal.

How this is worked out

6 steps
  1. Age used: 5 cat years (age entered directly).
  2. First two years = 15 + 9 = 24 human years.
  3. Each year after the second is worth 4 human years for a cat: 4 x 3 = 12.
  4. Total = 24 + 12 = 36 human years.
  5. At this age the animal gains about 4 human years per pet year.
  6. Human-equivalent 65 is reached at about 12.25 cat years.
Age conversion charttable
petYearshumanYears
115
224
328
432
536
640
744
848
952
1056
1160
1264
1368
1472
1576
1680

Results are general information, not financial, tax, legal, medical or engineering advice.