Pet BMI Calculator

Combine a 1-9 body condition score with your pet's weight and chest girth to get a reference body-condition result for a dog or cat. All processing runs locally in your browser. Your data is not uploaded to any server. 100% Local

How to Use the Pet BMI Calculator

Pick the body condition score that matches how your pet looks and feels, then enter its weight and chest girth. Press Calculate to see the reference category and the weight-to-girth index. The score guides the conclusion; the index adds a quick number you can track over time.

Reading a body condition score

• 1-3: ribs, spine and hip bones are easy to see; the pet looks thin.
• 4-5: ribs are easy to feel with light pressure and a waist is visible from above.
• 6-9: ribs are hard to feel and fat covers the back and tail base.
• An index is only comparable for the same pet or the same breed and frame.

Features

• Reference category from a 1-9 body condition score
• Weight-to-girth index from weight and chest girth
• Simple enough to repeat monthly and track change
• Works for both dogs and cats
• All processing runs locally in your browser. Your data is not uploaded to any server.

Not veterinary advice. This calculator only provides an approximate reference. Different breeds have very different healthy shapes, so consult your veterinarian before starting a diet or weight program.

Related Tools