How Big Do Chinchillas Get? [Shocking Details]

Wondering how big a chinchilla gets is a common concern for anyone who hasn’t owned a chinchilla, and is considering adopting a chinchilla soon.

I was the same way and was completely clueless.

I’ve owned a female chinchilla now for quite some time, and here’s what I can tell you on this topic.

So, how big do chinchillas get? Long-tailed chinchillas typically are considered full-grown between 8/10ths of a 1lb and 1lb. Short-tailed chinchillas are larger and are full-grown between 2 and 3lbs. Short-tailed chinchillas will range from 11-19 inches in length, and long-tailed chinchilla will range from 9-15 inches in length.

Here’s a quick table breakdown to explain more simply.

Sizing, Weight, and Length of Chinchillas

Type of ChinchillaAverage LengthAverage Weight
Short-Tailed Chinchilla11-19 Inches2 LBS- 3.2 LBS
Long-Tailed Chinchilla9-15 Inches8/10th of 1 LB- 1.1 LBS

In addition to explaining how big chinchillas get, I also wanted to answer other frequently asked questions about chinchilla growth.

Below, you will notice that I’ve created easy to navigate links that will allow you to skip to any specific section of this post that you desire to learn more about.


Here’s what I intend to break down for you in today’s post.

As stated previously, the table above will break down the averages for you, and the links will allow you to skip around.

If, however, you have 2-minutes to spare, we recommend checking out the full post directly below.

It will help you to provide the best care possible to your chinchilla by educating yourself on proper precautions to always keep in mind.

Here’s what you need to know.

How Big Is A Full-Grown Chinchilla?

Chinchillas do not get very big and make for fantastic pets.

As we know from the table above, there is a size difference between short and long-tailed chinchillas.

Your short-tailed chinchillas are typically going to be roughly ½ a pound larger than your long-tailed chinchillas in addition to a few inches longer.

It’s rare that a chinchilla will exceed the weights that we discussed previously above.

If they do, it’s likely that a diet change may need to be made to ensure your chinchilla is intaking the correct nutrients and growing properly.

My chinchilla is just a tad under 1lb and is full grown at two years old if this helps give you a better idea of what you are working with.

How Long Does It Take A Chinchilla to Be Fully Grown?

Chinchillas mature and grow quickly.

A chinchilla is considered full-grown at 8-months old.

Some chinchillas may be slightly delayed on this timeline based on diet.

Overall, within 1 year of owning a new chinchilla, your chinchilla should be at max size.

Baby Chinchilla Sizing and Growth

Man, those baby chinchillas are about as cute as it gets.

Although small and fragile, they are something to show off to friends a family.

A baby chinchilla is much smaller than a full-grown chinchilla.

Overall, a baby chinchilla will weight approximately 25-80 grams.

Most of this seems to be from their beautiful and full coats of fur.

What Changes as Chinchillas Grow?

Overall, not much changes as your chinchilla grows and matures.

Except in the beginning.

In the early stages, a baby chinchilla still needs to remain with their mother for 6-8 weeks.

You can read more about chinchilla breeding and reproduction here.

The female mother chinchilla nurtures the baby chinchillas, also known as “kits” and ensures they nurse and get the nutrients and care they need for roughly 2 months.

Following this stage, your chinchilla will transition to a regular diet consisting of pellets and timothy hay.

Once they have switched to this diet, it remains their recommended diet for the rest of their lifespan, which can range from 15-20 years.

Provide Adequate Space

Now that we know how big a chinchilla gets, how do we make sure they are adequately cared for?

The first thing you must do is ensure you are proving a large enough chinchilla cage.

I have a post that you can see here that breaks this down for you in-depth.

I personally am still an advocate of the Critter Nation 2 chinchilla cage (Link to Amazon)

It’s dual levels, plenty of space, and allows your chinchilla to maximize their desire to jump and climb on everything.

It’s undoubtedly an awesome and one of the best chinchilla cages to consider.

I have a full review of the Critter Nation 2 cage you can see here.

Outside of this, you need to ensure you keep your chinchillas’ diet in check.

Make sure you stick with the recommended chinchilla hay and only use pellets designed explicitly for chinchillas.

Tools and Measuring

Shockingly, keeping tabs on your chinchilla’s growth is something that’s recommended, and that should be completed.

Luckily, scales exist that are designed to help you weigh your chinchilla.

Doing so lets you spot fluctuations and potential issues early before an illness or issue has time to progress further.

Use a scale such as the Digital Pet’s Scale (Link to Amazon)

A chinchilla becoming overweight or underweight is a real concern to take seriously.

Weighing your chinchilla every month or two, let’s you understand if you have an issue to deal with on your hands.

Simply double-checking makes sure everything seems reasonable and you will be in great shape.

If you do notice any issue, contact a Vet as soon as possible so you can find the root of the problem.

Final Thoughts

I know you arrived here initially for a quick and straightforward answer.

Hopefully, that was provided, and additional insight was shed on what you can expect as your chinchilla grows.

They are friendly and extremely affectionate pets.

Take ethically care of them, and they will undoubtedly love you back.

What Stories Can You Share on This Topic?

As always, I want my readers to chime in and share their insights and knowledge on a topic.

What other precautions do you take to keep your chinchilla’s growth and weight in check?

What other information can you shed on this topic?

Be sure to share your thoughts, concerns, and stories by dropping a comment below.

As always, Chili and I appreciate you stopping by and reading.

We will see you next time!



Josh Martin

My Name is Josh and this is my 1 year old female chinchilla "Chili". We created Planet Chinchilla to share all the stories about owning a chinchilla that you need to know.

2 thoughts on “How Big Do Chinchillas Get? [Shocking Details]

  1. It saddens me to say. I just lost my Charlie. I have a lower level part of the house that Charlie would run around in That was a safe area. Well we have these small cubby doors that lead to the underside of the house that contain the sunk pump. In the 2 years we’ve lived there they have never been opened and they are very hard to open. Well somehow they ended up opened while he was at play and he drowned in the sunk pump. I am beyond hard broken. Been crying for 2 days. Needless to say I just bought Charlotte today. She’s white with beige tones and is very pretty. So I am starting the bond process with her.

    1. I am so sorry to hear that. Chinchilla proofing can often be more challenging then we think. Chinchillas are clever with their ways to get into odd spaces. Again, very sorry to hear this happened and I wish you the best of luck with Charlotte!

Leave a Reply

Your email address will not be published. Required fields are marked *

Recent Content