How to Convert Cat Years to Human Years

The idea of cat or dog years is really not as simple as it seems on first sight. For starters, cats mature faster than humans do, which means that kittens get older much faster (in human years) than they do as adults.

We humans have long gestation periods and care for our young for many years. Kittens are born after 66 days (give or take) and need much less care compared to our own babies. Matching cat years to human years is, therefore, not linear.

At first, they age rapidly, adding 1.5 human years every month during the first 6 months of their life. For the next 6 months, you add 1 human year each. When they are 1 year old, kittens count 15 human years. Maturity is reached by the time they are 2 years of age, which corresponds to 24 human years. From this point forward, you add 4 human years per year for indoor cats, and 8 years for outdoor cats. If your cat is both indoor and outdoor, you add 6 years. Due to less exertion and fewer injuries, indoor cats live longer than outdoor cats.

Trying to convert the age of one species to that of another is no exact science. Because of this fact, there are alternative measures for this conversion.

If you want to calculate your cat’s age directly, simply enter your cat’s age into this calculator.

The oldest cat ever known was Nutmeg, a male from the UK that died on August 29th, 2017 at 32 years of age. Being an indoor cat, Nutmeg was 144 human years old. Yikes!

For completion and quick reference, here is a chart that includes the first year of your cat’s life as well.

Cat Years Chart

Cat's Age

Indoor Cats

Indoor & Outdoor

Outdoor Cats

1 Month

1.5 Human Years

1.5 Human Years

1.5 Human Years

2 Months

3 Human Years

3 Human Years

3 Human Years

3 Months

4.5 Human Years

4.5 Human Years

4.5 Human Years

4 Months

6 Human Years

6 Human Years

6 Human Years

5 Months

7.5 Human Years

7.5 Human Years

7.5 Human Years

6 Months

9 Human Years

9 Human Years

9 Human Years

7 Months

10 Human Years

10 Human Years

10 Human Years

8 Months

11 Human Years

11 Human Years

11 Human Years

9 Months

12 Human Years

12 Human Years

12 Human Years

10 Months

13 Human Years

13 Human Years

13 Human Years

11 Months

14 Human Years

14 Human Years

14 Human Years

1 Year

15 Human Years

15 Human Years

15 Human Years

1.5 Years

20 Human Years

20 Human Years

20 Human Years

2 Years

24 Human Years

24 Human Years

24 Human Years

3 Years

28 Human Years

30 Human Years

32 Human Years

4 Years

32 Human Years

36 Human Years

40 Human Years

5 Years

36 Human Years

42 Human Years

48 Human Years

6 Years

40 Human Years

48 Human Years

56 Human Years

7 Years

44 Human Years

54 Human Years

64 Human Years

8 Years

48 Human Years

60 Human Years

72 Human Years

9 Years

52 Human Years

66 Human Years

80 Human Years

10 Years

56 Human Years

72 Human Years

88 Human Years

11 Years

60 Human Years

78 Human Years

96 Human Years

12 Years

64 Human Years

84 Human Years

104 Human Years

13 Years

68 Human Years

90 Human Years

112 Human Years

14 Years

72 Human Years

96 Human Years

120 Human Years

15 Years

76 Human Years

102 Human Years

128 Human Years

16 Years

80 Human Years

108 Human Years

136 Human Years

17 Years

84 Human Years

114 Human Years

144 Human Years

18 Years

88 Human Years

120 Human Years

152 Human Years

19 Years

92 Human Years

126 Human Years

160 Human Years

20 Years

96 Human Years

132 Human Years

168 Human Years

21 Years

100 Human Years

138 Human Years

176 Human Years

22 Years

104 Human Years

144 Human Years

184 Human Years

23 Years

108 Human Years

150 Human Years

192 Human Years

24 Years

112 Human Years

156 Human Years

200 Human Years

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