Pets & Animals

Cat Age Calculator

See where your cat sits in human terms.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Human years
Human years
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Life stage
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Cat Age Calculator by TheCalcTools

How the Cat Age Calculator works

Enter your cat’s age in years (use decimals for months, for example 0.5 for six months).

Year one counts as 15 human years, year two as 9 more, then each cat year adds 4.

Life stage labels follow the categories used by feline veterinary guidelines.

The formula

Age ≤ 1: 15 × age1–2 years: 15 + 9 × (age − 1)

Worked example

Using the default values shown in the calculator:

Cat's age (years)8
  1. 24 + (8 − 2) × 4 = 48.0 human years.
  2. Life stage: Mature adult.

Result:

Human years48.0
Life stageMature adult

Frequently asked questions

Do indoor cats live longer?

Typically yes. Indoor cats often live into their mid to late teens, while outdoor cats face more risks.

How often should senior cats see a vet?

Many vets suggest check-ups every six months from around age 10. Ask your own vet for a schedule.

Sources and further reading

Dog Age CalculatorHow old is your dog in human years? Two methods side by side Age CalculatorFind your exact age in years, months and days, how many days you have lived, and how… Percentage CalculatorChoose the question you want answered, enter two numbers, and get the percentage result…

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.