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The litter tray

Join our community of cat lovers on the Mumsnet Cat forum for kitten advice and help with cat behaviour.

How big will my kitten get?

13 replies

KittenTax · 14/02/2026 10:35

We know he will be big but wondering if anyone can suggest how big. He is 4 months old (well will be tomorrow) and weighs 3.3kg! (This was from me standing on scales without him and holding him so not the best measurement). He is also a fluff ball which makes him look bigger.

His brother is not as big and comes in at 2.7kg

How big will my kitten get?
How big will my kitten get?
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OSTMusTisNT · 14/02/2026 10:36

Is he a moggy or pedigree? And, will he be getting his 'little dudes' chopped off?

KittenTax · 14/02/2026 11:23

Moggy, mum is Norwegian forest dad is ragdoll.

Vet recommended waiting for neutering, they are not interested in the outside much yet but come summer the doors will be open in the summer so will need to get them done before then.

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KittenTax · 14/02/2026 11:49

He no longer fits on the cat post!

How big will my kitten get?
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ElizabethVonArnim · 14/02/2026 12:34

Boy cats get to about 5kg. Obviously this is huge generalisation.

FunkyMonks · 14/02/2026 18:42

He’s a mix of two large breed cats so likely to be very big we have two ragdoll kittens and female is slightly bigger than your boy she is 4.5 months old her brother is only a little bit smaller than her.
Ragdoll male can reach 9.1 KG when fully grown but they don’t mature until 4 years old.
The Norwegian Forest female weight is 8KG fully grown so he will be a big cat when older bless.
He is super cute as is his brother OP.

KittenTax · 14/02/2026 19:12

9kg would be exciting. My son would love a very large cat. He is a very mellow chilled ball of fluff!

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Overtheatlantic · 14/02/2026 19:14

No idea but he’s utterly gorgeous 😻

MoiraPlunkett · 14/02/2026 19:17

How big are his feet? If he has big feet it's likely he will be a big - and loooong - boy😻

NamingNoNames · 14/02/2026 19:19

He has very large paws.

Grumpyoldpersonwithcats · 14/02/2026 20:04

Probably not this big 🤣

How big will my kitten get?
KittenTax · 22/02/2026 17:01

Photo taken today. He is 18 weeks old now. He is lying next to my quilting ruler.

Think he will be bigger than 5kg. He is 3.6kg already. Looking forward to seeing how big he will get.

How big will my kitten get?
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KittenTax · 14/03/2026 19:18

He is 5 months today. Already 4.3 kg. Exciting to see how big he will get.

Here he is posing for the camera.

How big will my kitten get?
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KittenTax · 05/04/2026 15:48

Today’s weight in at a mighty 4.9kg with the all grey ‘little one’ 3.7kg.

The little one does have a look of permanent confusion.

How big will my kitten get?
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