Cat Age Calculator
See where your cat sits in human terms.
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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
Worked example
Using the default values shown in the calculator:
| Cat's age (years) | 8 |
|---|
- 24 + (8 − 2) × 4 = 48.0 human years.
- Life stage: Mature adult.
Result:
| Human years | 48.0 |
|---|---|
| Life stage | Mature 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
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.