Pet Age Calculator

“My dog is 10 — what is that in human years?” The old rule of multiplying by 7 is now outdated. Recent research shows that the rate at which dogs age varies significantly by size and life stage.

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Pet Age Converter

Species Lifecycle Bridge

RESET

Convert your pet's age to human years to understand their life stage.

🐶 Dog🐱 Cat

Pet Age

Dog Size

Small (-10kg)MediumLarge (25kg+)

Equivalent Human Age

29

세

청년기입니다. 왕성한 활동을 즐길 시기입니다.

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Dog Age Conversion (by size)

Small dogs (under 10 kg)

Dog Age	Human Age Equivalent
1 year	~15 years
2 years	~24 years
5 years	~36 years
10 years	~56 years
15 years	~76 years

Large dogs (25 kg+) — age faster than small dogs

Dog Age	Human Age Equivalent
1 year	~15 years
5 years	~40 years
10 years	~66 years
13 years	~96 years

Cat Age Conversion

Cats have less size variation between breeds, so a single scale is used.

Cat Age	Human Equivalent	Life Stage
1 year	~15 years	Adolescent
2 years	~24 years	Young adult
6 years	~40 years	Early middle age
10 years	~56 years	Late middle age
15 years	~76 years	Senior
20 years	~96 years	Very old

Health Care by Life Stage (small dogs)

Stage	Age	Key Care
Puppy	0–1 year	Complete vaccines, spay/neuter, socialization
Young adult	1–3 years	Annual check-ups, dental care
Middle age	4–7 years	Weight management, heart and joint monitoring
Senior	8–11 years	Twice-yearly vet visits, prescription diet review
Geriatric	12+ years	Pain management, cognitive decline monitoring
Related Tools: Anniversary Calculator · D-Day Calculator