Free tool
Cat age calculator
Work out your cat's age in human years the accurate way. Cats age fast early on and then steadily, so the real figure is nothing like 'multiply by seven'. See your cat's human age and life stage.
The "seven cat years" myth
The idea that one cat year equals seven human years is a myth, just as it is for dogs. Cats do not age at a steady rate. They grow up very fast in their first two years, reaching the equivalent of a young adult by around their second birthday, and then age more gradually. Multiplying by seven gets a cat's real age wrong at almost every stage of its life.
How cats really age
A more accurate picture, and the one vets generally use, works like this. A cat's first year is worth roughly 15 human years, and the second adds about another nine, so a two-year-old cat is loosely comparable to a person of about 24. After that, each cat year adds around four human years. Unlike dogs, cats do not vary hugely by size, so one calculation works well for most cats, which is what the calculator above uses.
What the life stages mean
Vets tend to divide a cat's life into stages: kitten and junior in the first couple of years, prime adult from around three to six, mature from about seven to ten, senior from eleven to fourteen, and geriatric from fifteen onwards. Each stage shifts a cat's needs. Older cats are more prone to kidney disease, arthritis, dental problems, and weight changes, so from the mature years on they benefit from more frequent vet check-ups, ideally twice a year, to catch these things early while they are most treatable.
Common questions
How do you calculate a cat's age in human years?
Count the first year as about 15 human years and the second as about nine more, so a two-year-old cat is roughly 24 in human terms. After that, add about four human years for each cat year. So a five-year-old cat is about 36, and a ten-year-old about 56. This calculator does the maths for you.
Is one cat year seven human years?
No, that is a myth. Cats mature very quickly in their first two years, reaching the equivalent of a young adult, and then age more gradually at roughly four human years per cat year. The 'times seven' rule gets almost every age wrong for cats just as it does for dogs.
When is a cat considered a senior?
Cats are generally considered mature from around seven, senior from about eleven, and geriatric from fifteen. Many cats live well into their late teens or beyond, especially indoor cats. Senior cats benefit from more frequent vet check-ups to catch age-related problems like kidney disease early.
Do indoor cats live longer than outdoor cats?
On average, yes, often considerably. Indoor cats avoid many of the risks of outdoor life, such as traffic, fights, and disease, and frequently live into their mid to late teens or beyond. Whatever your cat's lifestyle, good diet, weight control, and regular vet care all help it live a long, healthy life.
This calculator gives a general estimate based on age. Individual cats vary, so treat the result as a helpful guide rather than an exact figure, and speak to your vet about your cat's specific health and life stage.