Pet Life Expectancy Calculator
Estimate your pet's life expectancy from breed, size and lifestyle.
How long can you expect your dog or cat to live? Lifespan varies enormously: a Great Dane averages 7–10 years while a Toy Poodle often reaches 16+. This calculator estimates life expectancy from species, size category, weight, neutering and indoor/outdoor lifestyle, drawing on UK and US veterinary lifespan studies.
How this calculator works
Smaller dogs live significantly longer than large ones (each 2 kg over body-mass adds roughly one month off median lifespan in big breeds). Neutered/spayed pets and indoor-only cats live notably longer due to reduced cancer and accident risk.
Frequently asked questions
Can lifestyle really add years?
Yes. Indoor-only cats live an average of 5–8 years longer than outdoor cats, mostly due to fewer accidents, infections and predator attacks.
Why do small dogs live longer?
Larger dogs grow faster and accumulate cellular damage sooner — the same reason elephants live longer than mice doesn't apply within species.
What's the single biggest factor I can control?
Body condition. Lean dogs (BCS 4–5) live up to 2.5 years longer than overweight ones — confirmed by long-running Labrador studies.
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