The body condition score (BCS) is a 9-point scale vets use to describe how much fat a cat carries — from 1 (emaciated) to 9 (severely obese), with 4–5 considered the middle of the scale. You assess it by feeling the ribs and looking at the waist and belly, not by weight alone.
Why vets use BCS instead of weight
Weight changes with frame size, breed and muscle. The BCS looks at what that weight is made of, which is why the WSAVA Global Nutrition Guidelines promote it as part of every nutritional assessment. Two cats can weigh the same and score very differently.
The 9-point scale at a glance
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
1–3
Below the middle
Ribs and bony points become easier to see or feel; waist and tuck are more pronounced.
4–5
Middle of the scale
Ribs are easy to feel with a thin cover; a waist and slight abdominal tuck are visible.
6–9
Above the middle
Ribs become harder to feel; the waist reduces and the abdomen becomes rounder.
| Score | What you feel and see | |---|---| | 1–3 (thin range) | Ribs, spine and hips easily visible or felt with no fat cover; waist and belly tuck very pronounced | | 4–5 (middle of the scale) | Ribs felt easily with a thin fat cover; waist visible from above; slight belly tuck from the side | | 6–7 (above middle) | Ribs felt with some pressure; waist less defined; belly starting to round | | 8–9 (obese range) | Ribs hard to feel under a thick fat layer; no visible waist; belly rounded or hanging |
"Middle of the scale" describes the scoring system, not a diagnosis for your individual cat — your vet confirms what's right for them.
How to check your cat at home
- Feel the ribs. Run your fingertips across the ribcage. Can you feel each rib easily, or do you have to press?
- Look from above. Standing over your cat, is there a visible waist behind the ribs?
- Look from the side. Does the belly tuck up behind the ribs, run straight, or hang low?
- Note it down. Record the date and what you observed — trends matter more than one check.
What BCS is not
- It is not a cat BMI and not a weight target.
- It is not the same as muscle condition — vets separately assess muscle, especially in older or ill cats.
- A home check is not a confirmed score. Your vet confirms BCS with a hands-on exam.
When to contact your vet
- You can't feel your cat's ribs without pressing firmly
- Ribs, spine or hip bones look suddenly prominent
- Your cat is gaining or losing weight without a planned change
- You're considering a weight-loss plan — safe targets and pace should come from your vet
Track the trend alongside
A BCS note plus regular weigh-ins gives your vet the full picture. The PetsLately Weight Tracker records weigh-ins and shows the mathematical trend — bring both to your next visit.
This guide explains the scoring system. It does not assign your cat a score or diagnose any condition — that's your veterinarian's job.