Cat BMI Calculator

A rough body-mass index for cats (informational).

Weight

Height at shoulder

Cat BMI (kg/m²) 72

Formula: BMI = weight ÷ (height in m)²

Step-by-step with your numbers:

1. Values used:

2. Weight = 4.5

3. Height at shoulder = 25

5. Height at shoulder in metres = 25 / 100 = 0.25 m

6. Height at shoulder squared = 0.25 x 0.25 = 0.0625

7. Cat BMI = Weight / Height at shoulder squared = 4.5 / 0.0625 = 72kg/m²

Did we solve your problem today?

An informational body index for cats. A vet's Body Condition Score (1–9) or feline rib-cage measurements are more reliable than BMI.

The math behind it

BMI = weight (kg) ÷ height at shoulder (m)². Treat it only as a rough trend for one cat.

4.5 kg, 25 cm → 72.

Overweight cat?

Most adult cats are healthiest around 4–5 kg, but it varies by breed and frame.