Dog BMI Calculator

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

Weight

Height at shoulder

Dog BMI (kg/m²) 80

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

Step-by-step with your numbers:

1. Values used:

2. Weight = 20

3. Height at shoulder = 50

5. Height at shoulder in metres = 50 / 100 = 0.5 m

6. Height at shoulder squared = 0.5 x 0.5 = 0.25

7. Dog BMI = Weight / Height at shoulder squared = 20 / 0.25 = 80kg/m²

Did we solve your problem today?

An informational body-mass index for dogs. Dogs vary hugely by breed, so a vet's Body Condition Score is far more meaningful than any BMI.

The math behind it

BMI = weight (kg) ÷ height at shoulder (m)². Use it only as a rough trend for an individual dog, not across breeds.

20 kg, 50 cm → 80.

Is there an official dog BMI?

No — vets use the 9-point Body Condition Score instead.