Dog 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.
Larger breeds age faster after maturity. Ignored for cats.
Human-equivalent age
39.0 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
5.00 years
Reaches human-equivalent 65 at
10.20 years
Model used
AVMA / AAHA staged canine model, size-adjusted
Size band used
Medium (21-50 lb / 9-23 kg)
Age taken from
age entered directly
Summary
A 5-year-old dog is about 39 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 dog years (age entered directly).
  2. First two years = 15 + 9 = 24 human years.
  3. Each year after the second is worth 5 human years for medium (21-50 lb / 9-23 kg): 5 x 3 = 15.
  4. Total = 24 + 15 = 39 human years.
  5. At this age the animal gains about 5 human years per pet year.
  6. Human-equivalent 65 is reached at about 10.2 dog years.
Age conversion charttable
petYearshumanYears
115
224
329
434
539
644
749
854
959
1064
1169
1274
1379
1484
1589
1694

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