How To Tell The Age Of A Cat In Human Years

How To Tell The Age Of A Cat In Human Years


An easy method for calculating your cat’s age in human years is to multiply their age in cat years by 4. For example, a 10-year-old cat would be the equivalent of a 50-year-old human. However, since there are many factors that affect a cat’s lifespan and determine how long they live, this simple calculation doesn’t give us an exact equivalence between cats and humans. In fact, it might even be off by as much as two or three years! The purpose of this article is to give you more information about how cats age differently than humans do so that you can better understand what your own kitty is going through with each passing year.

How To Tell The Age Of A Cat In Human Years

To determine how old a cat is in human years, look at its teeth. Cats have two sets of teeth: baby teeth (or deciduous) and permanent adult teeth. Baby teeth begin to fall out when the permanent set begins to grow. The average age for cats to lose their baby teeth is around 7 months old for most cats, but some may lose them earlier or later than this average. You can tell if your cat has lost its baby teeth by gently opening its mouth and looking at the upper jaw where there should be no spaces between any of its bottom row of permanent adult incisors and premolars. If there are spaces between any tooth pairs then they are probably still deciduous, which means that it has not yet reached adulthood even though it might be several months old already!

As well as looking at how many times your cat has shed its baby onesies over time you should consider other factors such as lifestyle habits (e.g., if it spends a lot of time outdoors), health issues (e.g., if there are dental problems), etc., when diagnosing whether or not an animal has entered adulthood yet because these things can influence growth rates significantly without affecting overall size much at all – so don’t just rely on naked eye observations alone!

1. Determine the cat’s age in weeks.

It’s important to know the cat’s age in weeks, because this information is a crucial part of being able to tell how old your cat is in human years. To calculate a cat’s age in weeks, you must first determine how long it has been since your feline friend was born. If you don’t know exactly when you got your kitty, check one of its ears for a microchip identification tag or tattooed number. Sometimes these are hidden under fur so it may require brushing their coat before searching for them.

Once you have calculated the age in weeks, multiply that number by seven (seven times), then add four hundred and forty-five days (four hundred forty-five days). That will give us our answer: 3 years and 5 months old! That’s just over three years old—not too bad!

2. Multiply the number of weeks by 3.

If you know your cat’s age in weeks, multiply that number by 3. For example, a 2-year-old cat would have been born at 4 months old, or 16 weeks old.

The formula for calculating a cat’s age in human years is the same regardless of whether you know the week count or not: x (the number of years) = (y + 30).

For example, if you have a 1-year old kitten who was born at 8 weeks, then: y + 30 = 1 + 30; y = 1; x = 2 years old!

3. Add 10 to arrive at a cat age in human years.

  • Add 10 to arrive at a cat age in human years.

Cats are generally considered to be about 15 human years, so if your cat is three, it’s twenty-three in cat years. If your cat is 14, that’s fifty-four in cat years (14 + 40 = 54).

4. Determine the cat’s human age during its first year of life.

Once you’ve determined your cat’s age in human years, the next step is to determine how old your cat was during its first year of life. Multiply the number of weeks a kitten spends in its mother’s stomach by four to arrive at an approximate human age for that kitten.

Once you’ve done that, add 10 to get an approximate human age during each month of its second year as well as a total approximation based on these two calculations:

  • A six-month-old kitten will have spent 7 months inside his mother’s womb (22 weeks). Multiply 22 by 4 and add 10 to get 42 years old.
  • A nine-month-old kitten will have spent 6 months with her litter (18 weeks). Multiply 18 by 4 and add 10 for 48 years old.

5. Look at your cat’s teeth to understand its true age in human years.

Check out your cat’s teeth. They’re the best way to tell its true age in human years, because cats have 28 teeth that replace themselves every 3-4 weeks (and they’re important for chewing and digesting food).

  • Age 1: 0-6 months – Your kitten won’t have any adult teeth yet, but you can see their baby teeth forming. If you look closely at these little guys, they’ll be short and stubby with round tops that look more like gum tissue than tooth.
  • Age 2: 6-12 months – By now your little kitty likely has a full set of molars growing in behind those adorable baby teeth! They may not seem like much yet, but once they come out you’ll be looking at big old choppers!
  • Age 3: 1.5 – 2 years old – It’s time for those tiny pearly whites to make way for bigger and better ones! Your cat’s incisors will start pushing through where their canines used to be so get ready for some chompers that could seriously do some damage if they got hold of anything while playing around with other pets or children running around the house during playtime (which means no eating from plates on counters!).

Here are some tips to help you gauge your cat’s true age

  • Girth is a good indicator of age. The more girthy your cat, the older it is. Older cats tend to be heavier than younger ones, so if your cat has been putting on weight recently and you can’t figure out why, consider that it may be due to natural aging.
  • One thing many people notice when their cats get older is that they become less active—they walk slower and lie around more often. However, some cats actually become more playful as they age! If yours does this, consider yourself lucky: your cat will likely enjoy playing for longer periods of time before needing to take a break and rest up again later on in the day or evening (or night).


As you can see, even in the first year of life, cats age very fast. There’s no way to know whether they’re 1 or 2 years old without doing a tooth test! Age may not be as important as personality when it comes to matching you with your feline friend, but it can give you a better understanding of your cat and how to care for them over time.

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