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LifeSpan
The classic '15 for year one, 9 for year two, 4 per year after' rule, done precisely.
Indoor cats often live longer than outdoor cats, and individual health varies widely — this calculator uses a commonly cited simple aging rule, not a veterinary-grade model tailored to your specific cat.
After the first two years, cats age a bit more slowly than dogs on a per-year basis (roughly 4 human years per cat year versus 5 for dogs) — one reason well-cared-for indoor cats often live into their late teens or twenties.
Duration between two times of day, in hours and minutes.
OpenHours worked from clock-in, clock-out, and break time.
OpenWeekly total hours and overtime from daily entries.
OpenAnnual cost of your daily commute.
OpenHuman-equivalent age
36 years
What you entered
Years 1–2
15 + 9= 24 yearsEach year after year 2
+ (3 × 4)= 36 yearsResult
Human-equivalent age: 36 years
A 5-year-old cat is roughly equivalent to a 36-year-old human, using the classic 15/9/4 rule — indoor cats tend to live longer and age slightly differently than outdoor cats.