How to Calculate a Cat's Age in Human Years

By eHow Pets Editor

Instructions

Step 1:
Determine how many calendar years your cat has been alive.
Step 2:
Start with 15 human years for your cat's first year. This calculation is based on the comparative ages when cats and humans reach maturity. Cats reach sexual maturity around the end of their first year, compared to humans, who reach it in their mid-teens.
Step 3:
Allow nine more years for the second year of your cat's life. These numbers are just approximations and may depend on the breed of cat. For example, the Maine Coon does not reach maturity until three to five years of age.
Step 4:
Include four years for each of your cat's subsequent years. There is still a fast rate of development compared to humans but less so than in the first two years.
Step 5:
Add all of these numbers together to determine your cat's age in human years.
Step 6:
Refer to the following chart of cat's ages and their relative human equivalent: 1=15, 2=24, 3=28, 4=32, 5=36, 6=40, 7=44, 8=48, 9=52, 10=56, 11=60, 12=64, 13=68, 14=72, and 15=76.
Step 7:
Consult an online calculator for simplicity or to specify the exact number of years and months of your cat's life (see Resources).

Resources

Cat age converter

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