Cat age chart: cat years to human years table

This cat age chart shows how cat years compare to human years using a simple, commonly used guide. Cats do not age on a straight 1:7 scale, and Cornell Feline Health Center explains this general approach to feline ageing.

Use the cat age chart below for a quick, simple comparison.

Cat age chart: cat years to human years

Cat age	Human years
1 month	1 year
2 months	3 years
3 months	4 years
4 months	6 years
5 months	8 years
6 months	10 years
7 months	12 years
12 months	15 years
18 months	21 years
2 years	24 years
3 years	28 years
4 years	32 years
5 years	36 years
6 years	40 years
7 years	44 years
8 years	48 years
9 years	52 years
10 years	56 years
11 years	60 years
12 years	64 years
13 years	68 years
14 years	72 years
15 years	76 years
16 years	80 years
17 years	84 years
18 years	88 years
19 years	92 years
20 years	96 years

This style of chart reflects the commonly used rule that the first two years of a cat’s life equate to around 24 human years in total, and that each year after that adds about four human years.

How cat years compare to human years

A simple way to think about it is this:

• Year 1: your cat develops quickly, reaching roughly the equivalent of a mid-teen human
• Year 2: your cat reaches about 24 human years
• After that: each additional cat year is usually counted as about 4 human years

That is why a 10-year-old cat is often described as being in the mid-50s in human years, rather than 70.

Why this chart is only a guide

A cat age chart is useful, but it should not be taken too literally.

Cats age as individuals. Breed, genetics, lifestyle, whether they live indoors, and overall health can all affect how a cat ages over time. That is why two cats of the same age may not seem to be in exactly the same stage of life.

Use this chart as:

• a quick reference
• a simple way to understand life stage
• a starting point for thinking about changing needs with age

It is not a way to predict lifespan, diagnose problems, or explain away a sudden change.

When is a cat considered senior?

This depends slightly on which life-stage model you look at, but many cats move through stages such as mature, senior, and super senior, rather than all older cats being treated the same.

In practical terms, many owners start thinking more about “senior cat” care once their cat reaches around 11 to 12 years old.

If you want a fuller explanation, our guide to what age is a cat considered senior helps explain when cats move into later life stages. You may also find physical signs of ageing in cats helpful if you are starting to notice small changes, and how long do cats live gives more context on lifespan overall.

How to use this cat age chart

The main value of a cat age chart is context.

For example:

• a 2-year-old cat is still a young adult, even if the human-year number sounds much older
• a 7-year-old cat may be moving into a more mature life stage
• a 12-year-old cat is often considered an older cat, even if they still seem bright, playful, and settled
• a 15-year-old cat may need a bit more support with comfort, routine, access, and regular vet checks

That does not mean something is wrong. It simply means your cat’s needs may change gradually with age.

When to speak to your vet

A cat age chart can help you understand life stage, but it cannot explain sudden changes.

Speak to your vet if your older cat has:

• a noticeable drop in appetite
• weight loss
• new stiffness or difficulty jumping
• litter tray changes
• confusion, restlessness, or unusual vocalising
• any clear change from their normal behaviour

The chart gives context, but changes in appetite, mobility, litter tray habits, behaviour, or comfort matter more than the number alone.

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