Pet Age Calculator: Dog & Cat Years to Human Years Free
Convert your dog or cat age to its human-years equivalent.
The "multiply by 7" rule is a myth. Use the real veterinary equivalence by species and age.
By VOV · Last updated: October 21, 2026
How it works
How it works: dog: 1st year = 15 human years, 2nd = 24, each extra year adds 5. Cat: 1st year = 15, 2nd = 24, each extra adds 4. Approximate developmental equivalences, not an exact biological conversion.
Use cases
- Discover how old your 5-year-old dog is in human years to adjust their diet accordingly
- Calculate the human-equivalent age of your adopted cat to understand exactly which life stage they're in
- Find out if your 3-year-old rabbit already counts as senior and needs a vet checkup
Frequently asked questions
Why doesn't multiply-by-7 work?
Because dogs mature super fast the first year (a 1-year-old pup is already a teenager). The real equivalence is curved, not linear.
Do large breeds age the same?
Not exactly: large breeds age faster after 5-6 years. This calculator uses the general average.
What about senior cats?
From 11 years they are considered senior and a vet check every 6 months is wise, same as dogs over 7-8 years.
How do I know my pet's current life stage?
The calculator shows the stage based on age: puppy or kitten, adult, mature or senior. Each stage has different needs for food, exercise and vet visits.
Does the calculator work for rabbits or other pets?
It's optimized for dogs and cats, which have the most studied formulas. For rabbits, ferrets or other pets the results are only a rough estimate.