Cat Age Calculator
Convert a cat's age to human years with the veterinary age chart, and see its life stage.
In human years
About 56
- Life stage
- Mature adult (7–10 years)
An age comparison, not a health check — cats age differently by breed, weight and indoor or outdoor life. Over 25 years extends the +4 rule beyond the chart.
Cat age chart (AAFP–AAHA)
| Cat | Human |
|---|---|
| 6 months | 10 |
| 1 year | 15 |
| 2 years | 24 |
| 4 years | 32 |
| 6 years | 40 |
| 8 years | 48 |
| 10 years | 56 |
| 12 years | 64 |
| 15 years | 76 |
| 18 years | 88 |
| 20 years | 96 |
| 25 years | 116 |
Show the work
Age in months
months = years × 12 + months
10 × 12 + 0 = 120 months
2 years = 24, then 4 more for each year after
human = 24 + (months − 24) ÷ 12 × 4
24 + (120 − 24) ÷ 12 × 4 = About 56
How it works
AAFP–AAHA chart (2010): 1 year = 15 human years, 2 years = 24, then +4 for every year after (e.g. 10 = 56); months under 2 years follow the chart; life stages from the 2021 AAHA/AAFP Feline Life Stage Guidelines
Questions
- How does the cat age calculator work?
- AAFP–AAHA chart (2010): 1 year = 15 human years, 2 years = 24, then +4 for every year after (e.g. 10 = 56); months under 2 years follow the chart; life stages from the 2021 AAHA/AAFP Feline Life Stage Guidelines.
- What do I need to enter?
- Years, Months. Optional fields can be left blank.
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