How Big Will My Cat Get Calculator

Estimate adult cat weight from a kitten's 16-week weight.

Estimated adult weight 4

Estimated adult weight 8.818

Formula: adult ≈ weight at 16 weeks × 2

Step-by-step with your numbers:

1. Values used:

2. Weight at 16 weeks = 2

4. Estimated adult weight = Weight at 16 weeks squared = 2 x 2 = 4

5. Estimated adult weight = 8.818

Did we solve your problem today?

A rough estimate of a kitten's adult size, doubling its 16-week (4-month) weight.

The math behind it

Kittens are roughly half their adult weight at 16 weeks, so adult ≈ 16-week weight × 2.

2 kg at 16 weeks → ~4 kg adult.

Big breeds?

Maine Coons keep growing for years and can far exceed this estimate.