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Convert Cat to Human Age Chart and Calculator

Published: 2021-06-16 - Updated: 2021-06-17
Author: Disabled World | Contact: Disabled World (Disabled-World.com)

Synopsis: Chart and calculator provide quick conversion of a cats age in years to an approximate equivalent human age. Cats age much more quickly in their first two years of life and then the aging process slows down and continues more steadily in that for every human 2 years, each cat year equals approximately 4 human years. On average, indoor cats may live from 12 to 18 years, and many even survive into their 20's.

Main Digest

Unlike dogs - who have different human age equivalents depending on their size - the conversion method for cat to human age is universal because cats are all roughly the same size. However, when comparing cat years versus human years there is no "true" mathematical formula. Nor, does one cat year equal seven human years as the age of a cat does not follow a linear curve compared with human age.


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Like many other animals, "childhood" and "adolescence" occur much faster than in humans. Kittens, when compared to newborn babies of human, grow very fast - especially in their first 6 months - before reaching puberty at about 6 to 8 months old. When they reach the age of 6 to 12 months, you can consider them to be the equivalent of at least 10 human years.

Cats age much more quickly in their first two years of life and then the aging process slows down and continues more steadily in that for every human 2 years, each cat year equals approximately 4 human years. Veterinarians generally agree that the first 2 years of a cat’s life are roughly equal to the first 25 years of a human life.

Keep in mind that felines who live outside (outdoor cats) tend to age far more quickly - sometimes twice as fast - than an indoor cat. On average, indoor cats may live from 12 to 18 years, and many even survive into their 20's. Whereas outdoor cats face greater threat of accident and/or illnesses, and average around 10 years of age.

Cat Age Equivalent in Human Years Calculator

Cat Age to Human Age Calculator
Cat Age in Years: Months:
Your Cat Age Equals:

 

Skittles (Big Puss) is a black and white senior cat pictured laying on the back of an old sofa.
Skittles (Big Puss) is a black and white senior cat pictured laying on the back of an old sofa.

Cat Age In Human Years Conversion Table

Vets have established an approximate correlation cat age chart to see an equivalence in human age. The chart listed below shows the 6 stages of cat development as well as the equivalent human age. Though not an exact science the chart below also indicates how cats mature at a much faster rate than humans do.

Cats AgeHuman EquivalentStage of Cats Life
1 Month 1 Year Kitten
2 Months 3 Years Kitten
3 Months 5 Years Kitten
4 Months 7 Years Kitten
5 Months 9 Years Kitten
6 Months 11 Years Kitten
12 Months 16 Years Junior
18 Months 20 Years Junior
2 Years 24 Years Junior
3 Years 28 Years Prime
4 Years 32 Years Prime
5 Years 36 Years Prime
6 Years 40 Years Prime
7 Years 44 Years Mature
8 Years 48 Years Mature
9 Years 52 Years Mature
10 Years 56 Years Senior
11 Years 60 Years Senior
12 Years 64 Years Senior
13 Years 68 Years Senior
14 Years 72 Years Senior
15 Years 76 Years Super Senior
16 Years 80 Years Super Senior
17 Years 84 Years Super Senior
18 Years 88 Years Super Senior
19 Years 92 Years Super Senior
20 Years 96 Years Super Senior
21 Years 100 Years Super Senior
22 Years 104 Years Super Senior
23 Years 108 Years Super Senior
24 Years 112 Years Super Senior
25 Years 116 Years Super Senior
38 Years 168 Years Super Senior

How to Tell a Cats Real Age

Veterinarians can tell a cat's true age by studying their:

  • Size
  • Ears
  • Eyes
  • Weight
  • Behavior
  • Blood work
  • Body condition
  • Medical history
  • Teeth and gums
  • Physical examination

Cat Life Stages

There are considered to be six stages of life for cats:

The Six Stages of a Cats Life
Kitten 0 to 6 months The young cat is growing rapidly and is usually not quite sexually mature.
Junior 7 Months to 2 years The cat reaches full size and learns about life and how to survive it.
Prime 3 to 6 years The cat is mature physically and behaviorally, is usually healthy and active, looks sleek and shiny and making the best of life.
Mature 7 to 10 years The cat is what we call "Mature", the equivalent to most humans in their mid-40's to mid-50's.
Senior 11 to 14 years The cat reaches the equivalent of around 70 human years.
Super Senior 15+ years Many cats will reach this stage, some do not show signs of being so old.

Printable Cat Age Chart: Cat Years to Human Years Conversion Table

Printable cat age to human age conversion chart.
Printable cat age to human age conversion chart.

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Cite Page: Journal: Disabled World. Language: English (U.S.). Author: Disabled World. Electronic Publication Date: 2021-06-16 - Revised: 2021-06-17. Title: Convert Cat to Human Age Chart and Calculator, Source: <a href=https://www.disabled-world.com/calculators-charts/cat-age.php>Convert Cat to Human Age Chart and Calculator</a>. Retrieved 2021-07-27, from https://www.disabled-world.com/calculators-charts/cat-age.php - Reference: DW#286-13985.