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Siberian Cat Weight by Age – Full Guide

Every kitten seems like they’re going to stay tiny forever, but soon enough you will have a fully grown cat on your hands. Have you ever wondered: How much does a Siberian cat weigh and how big do they get?

Siberian cats are a relatively large breed and they usually weigh around 10 to 15 pounds when they are fully grown. Although most of their growth happens within the first 18 months, it does take these particular felines quite some time to reach full maturity, and they can keep getting bigger until they are around 5 years old.

Siberian Cat Weight by Age

Read ahead in this article to find out everything you need to know when it comes to Siberian cats, and the weight you can expect them to be as they journey towards adulthood!

Siberian Cat Weight by Age

Siberian cats are majestic and quite striking animals. They have gorgeous, semi-long coats and they can grow to be reasonably large in comparison to other breeds. Although they may start life as adorable little kittens, by the time they reach full maturity they can weigh as much as 20 pounds or more.

To understand how a Siberian is expected to grow and change as they get older, we can take a look at how much they might weigh during the first few years of their life.

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Siberian Cat Weight by Age
AgeMaleFemale
3 Months1.5 – 2.2 kg (3.3 – 4.8 lbs)1.3 – 2.1 kg (2.9 – 4.6 lbs)
4 Months2.5 – 3.5 kg (5.5 – 7.7 lbs)2.3 – 3.3 kg (5– 7.3 lbs)
5 Months3.2 – 5.0 kg (7 – 11 lbs)2.5 – 4.5 kg (5.5 – 9.9 lbs)
6 Months3.5 – 5.5 kg (7.7 – 12.1 lbs)2.7 – 5 kg (6 – 11 lbs)
7 Months3.7 – 6.0 kg (8.2- 13.2 lbs)2.8 – 5.3 kg (6.1- 11.7 lbs)
8 Months3.9 – 6.5 kg (8.6 – 14.3lbs)2.9 – 5.5 kg (6.4 – 12.1 lbs)
9 Months4.0 – 7.0 kg (8.8 – 15.4 lbs)3 – 5.7 kg (6.6 – 12.6 lbs)
10 Months4.1 – 7.5 kg (9 – 16.5 lbs)3.1 – 5.9 kg (6.8 – 13 lbs)
11 Months4.2 – 8.0 kg (9.3 – 17.6 lbs)3.2 – 6.1 kg (7 – 13.4 lbs)
1 Year4.3 – 8.4 kg (9.5 – 18.5 lbs)3.3 – 6.3 kg (7.3 – 13.9 lbs)
3 Years4.4 – 8.8 kg (9.7 – 19.4 lbs)3.4 – 6.5 kg (7.5 – 14.3 lbs)
5 Years4.5 – 9 kg (10 – 20 lbs)3.5 – 6.8 kg (8 – 15 lbs)

These numbers are just the expected growth that you are likely to see with a Siberian cat, they are not exact figures. You might find that your Siberian doesn’t always fit perfectly into the range for their age, and that doesn’t necessarily mean that anything is wrong. Every individual is different, and some cats will grow very differently from others.

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Generally speaking, your cat is likely to gain between 0.5 and 1 pound every month for about the first year of their life. After this, they will probably grow at a slower rate.

When Are Siberian Cats Fully Grown?

Most domestic cats reach full maturity by around 18 months, but Siberian cats are a little slower to grow than average. They will often keep growing and maturing until they are around 5 years old, so you might see a few changes in them for quite some time.

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Siberian Cat Weight by Age

Usually, these cats have become about as large as they are going to get before their second birthday, but they may still put on a bit more weight and fill out a little over the next few years.

Although they can reach quite a considerable weight, Siberian cats are generally medium to medium-large in physical size. They are stocky and sturdy animals, rather than long and gangly, usually standing at around 9 – 12 inches tall and 15 – 18 inches long at their biggest.

Why Are Siberian Cats So Big?

They may not be the largest cats on the planet, but these felines do get pretty big. Why is it that some breeds are naturally bigger than others? When it comes to Siberian cats, it’s all about where they are from.

These cats originate from Russia, where the winters are cold and they needed to have a lot of meat on their bones. Their size and weight allow them to generate more body heat, and retain more energy between meals.

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This is also why they have such beautiful, luxurious coats. To keep themselves warm, Siberian cats are actually wearing three layers. They have a short, dense undercoat that is downy and soft, a slightly longer middle coat, and an outer protective coat as well.

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Siberian Cat Weight by Age

How Much Should My Siberian Cat Weigh?

One of the most common reasons why we, as owners, stress about the weight of our cats is because we are trying to figure out whether they are healthy and normal. The question of how much a Siberian cat SHOULD weigh, though, is often not a helpful one – for your peace of mind or for your cat.

Every cat is unique, and there is no strict formula for how big they should be, or how they should grow. Although there are general rules for what you might see each month as your kitten becomes a cat, it is far from an exact science. Just like with humans, cats will go through growth spurts and plateaus, so they are not always getting bigger at a steady rate.

It usually averages out to about 1 pound of growth each month, but it won’t happen at a perfectly consistent rate. The physical size of each Siberian cat will vary greatly as well. Some cats will just be bigger and smaller than others, so you can’t compare them all in the same way.

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Siberian Cat Weight by Age

Is My Siberian Cat a Healthy Weight?

Rather than comparing your Siberian to others, or looking at milestones that you are expecting them to reach, you only really need to think about whether they are healthy or not. After all, what you really want is for your cat to be safe, well, and happy.

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As you’re keeping an eye on your cat’s development, the only areas for concern are whether they are not growing as much as they should be, or they are putting on too much weight for their body size.

If you are noticing that your cat is consistently gaining less than 0.5 pounds per month within the first year, then you should take them to a vet. They may be struggling with malnutrition, a parasite, or an illness that is inhibiting their growth. Otherwise, you just need to make sure they are not getting overfed.

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Siberian Cat Weight by Age

Are Siberian Cats Prone to Obesity?

As a relatively large breed, Siberian cats do eat quite a lot. They are, however, active and energetic so they are not overly prone to becoming overweight or obese. Unfortunately, though, obesity is a growing problem among domestic pets, particularly in the United States.

It is estimated that around one third of all domestic cats in the US are overweight or obese, and this can lead to many health complications. Obese cats are at higher risk of developing all sorts of issues, including:

  • Cancer
  • Diabetes
  • Liver Disease
  • Heart Disease
  • Hypertension
  • Osteoarthritis
  • Joint Problems
  • Gastrointestinal Issues
  • Pancreatitis

With all of that in mind, it is really important that you keep an eye on the weight of your Siberian, and help them to stay fit and healthy.

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Siberian Cat Weight by Age

Is My Siberian Cat Overweight?

When you’re trying to figure out whether your cat is overweight or not, the scales aren’t always going to give you the answer. 15 pounds can be a lot for a smaller Siberian, but it could be too little for one that is simply a lot larger overall. Some fit and healthy male Siberian cats might weigh more than 20 pounds and still not be considered overweight.

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Siberian cats can also look like they might have a few extra pounds on them, even when they don’t. Most Siberians have bit of a belly pouch, that droops a little, allowing them to fill up over the cold winter months. 

There are, however, a few signs that you can look out for. Your Siberian cat might be becoming overweight if:

  • You can’t feel their ribcage through their fat layer
  • Their stomach always appears full and extended
  • They are constantly tired and lacking in energy
  • They struggle to jump or climb stairs
  • They don’t have any inward curve at the waist when you look from above

It is important to note that Siberian cats tend to have less of a distinctive waist than other medium to large breeds, so it may be hard to spot, even on a healthy cat.

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Siberian Cat Weight by Age

Summary: Siberian Cat Weight by Age Full Guide

So, how much do Siberian cats usually weigh as they get older? Well, Siberians typically grow to between 10 and 15 pounds, and they don’t reach full maturity until they are about 5 years old. They are often around 9 – 12 inches tall, and between 15 and 18 inches in body length.

Every cat is different, though, and some will naturally be significantly larger or smaller than others, while still being perfectly healthy.

These are medium to medium-large, majestic cats with heaps of personality. They love to stay active and on the move throughout the day, so it is pretty easy to keep them fit and healthy.

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