The method this chart uses to calculate cat age was developed by Monsieur LeBeau.

How are cat years calculated? As you can see, between the cat ages 0 to 2 years, there is a quick jump up in the relative age between humans and cats. From the age of 2 years we then add 4 years on for each human year until we reach the cat age of 14 years. From then on we add on 2 years for each human year after.

This is a much more accurate method of calculating cat age than using a simple linear method.

Note that this method used is only an estimate comparing cat to human ages. For different breeds of cat, the numbers can vary. You can contact a vetinarian for a more accurate calculation for your pet.