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Cat Age Calculator (Cat Years to Human Years)

Your cat's age in human years, using the veterinary life-stage chart, and which life stage it is in.

Results

Human-equivalent age 36.0 a
Life stage Young adult (1 to 6 years)
Months 60
How it changes
Human-equivalent ageCat's age, whole years 0.0 – 20.0. Human-equivalent age: 0 → 96Human-equivalent age0204060801000.05.010.015.020.0Cat's age, whole years (a)

The dashed line marks the value you entered.

What this tool does

Multiplying by seven is a myth that gets cats badly wrong: a one-year-old cat is already roughly a 15-year-old teenager, and by two it is like a 24-year-old adult. After that each cat year adds about four human years, the scale in the 2021 Feline Life Stage Guidelines of the American Animal Hospital Association and the American Association of Feline Practitioners. The same guidelines group cats as kittens up to one year, young adults to six, mature adults from seven to ten and seniors after that, when twice-yearly check-ups are usually advised. Many indoor cats now live well into their mid-teens or beyond.

Formula

1st year ≈ 15 human years · 2nd year +9 · then +4 per year

Variables

SymbolMeaningUnit
yrCat's age, whole yearsa
moPlus months—
HAHuman-equivalent agea
LSLife stage—
MOMonths—

Worked example

  • Cat's age, whole years5 a
  • Plus months0
  • Human-equivalent age36.0 a
  • Life stageYoung adult (1 to 6 years)
  • Months60

Limitations

  • The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
  • The default values are typical reference figures, not measurements of your situation. Replace them with your own data whenever you have it.