Cat Chonk Chart: Find Your Cat's Chonk Level

How to use the cat chonk chart

Tap the cat that looks most like yours. The chart runs left to right from too thin to OH LAWD HE COMIN'. Your pick shows up straight away, along with what a vet would call it.
Then check by feel. Tapping fills in the four checks with a typical cat at that level. Put your hands on your cat and change any answer that doesn't match. Ribs first, because a coat can't fake those.
Answer the bonus question if it appears. At the very top of the scale, one extra question about moving and grooming decides between Megachonker and OH LAWD HE COMIN'.
Add a weight if you know it. It turns the chonk level into pounds: roughly what your cat should weigh, and how much to lose or gain.
Share it or print it. Copy the result, send the link (it remembers your answers), or download a one-page chonk report to take to the vet.

Why this chonk chart is different

Search for a cat chonk chart and you get the same picture over and over: on Reddit, on Pinterest, on posters and coasters. It's a great joke. It just can't tell you anything about your own cat, and the body-fat figures that get attached to it online don't come from any study.

You place your own cat. Tap a level, then answer four hands-on questions. Nobody else turns the meme into something you can actually use.
Every level is tied to a real vet scale. Each tier maps to the 9-point feline body condition score, the system vets use in the exam room, so He Chonk means a score of 6 and roughly 10% over ideal weight.
Fluff can't fool it. The score comes mostly from what your hands feel on the ribs, and the loose belly flap most cats have is weighted so it can't push a Fine Boi up the chart.
It does the maths in pounds. Add a weight and you get an estimated ideal weight and how far there is to go.
A vet reviewed it. Dr. Priya Anand checked the mapping, and an automated test confirms on every build that each level returns the score it should.

How the chonk levels are worked out

The chonk chart went viral in late summer 2018: a cat body-fat chart relabelled with joke names and shared across Twitter and Reddit. The meme never defined its levels, so this tool anchors each one to the 9-point feline body condition score (BCS), developed by Laflamme and validated against DEXA body-composition scans. It's the scale the WSAVA Global Nutrition Committee and the AAHA weight-management guidelines refer to, and 5 out of 9 is ideal for most adult cats.

Your four answers produce the score, using the same engine as our cat body condition score tool:

BCS = round( 0.40 × ribs + 0.25 × waist
           + 0.20 × side profile + 0.15 × belly pad )

Then the score picks the chonk level:

Chonk level	Vet score	Vs. ideal weight	Approx. body fat
Too thin (off the chart)	BCS 1 to 3	10 to 40% under	under 15%
A Fine Boi	BCS 4 to 5	at ideal	15 to 24%
He Chonk	BCS 6	about 10% over	25 to 29%
A Heckin' Chonker	BCS 7	about 20% over	30 to 34%
Hefty Chonk	BCS 8	about 30% over	35 to 39%
Megachonker	BCS 9	40% or more over	40 to 45%+
OH LAWD HE COMIN'	BCS 9, mobility affected	40% or more over	40 to 45%+

The weight column uses the standard veterinary rule that each point above 5 is about 10% of body weight. The vet scale stops at 9, so the chart's two top levels share a score. They're separated by the one thing the meme itself draws: a cat so heavy that walking, jumping and grooming have become hard work.

The honest limitation: body condition scoring is a hands-on judgement, and even two vets often land a point apart. Treat the result as a screening estimate that tells you which direction to go.

Three worked examples

The tabby with the swinging belly

She looks like a Heckin' Chonker from across the room because her belly flap sways when she trots. But her ribs are easy to feel, she has a gentle waist from above, and her belly tucks up slightly from the side. The tool scores her a 5: A Fine Boi. That flap is the primordial pouch, and it's normal.

The 15-pound ginger

You have to press firmly to find his ribs, there's no waist at all, and his belly hangs below his rib cage. That's a score of 8, Hefty Chonk, about 30% over ideal. At 15 lb, his ideal weight works out near 11.5 lb, so roughly 3.5 lb to lose. At a safe pace that's several months of measured meals and more play, agreed with his vet.

The 20-pound cat who can't reach his back

No ribs to feel even pressing hard, fat over his lower back and face, and he's stopped grooming his rear end. That's a score of 9 with mobility affected: OH LAWD HE COMIN'. Because the vet scale tops out at 9, his ideal is 14.3 lb or less and he has at least 5.7 lb to lose. This one is a vet visit first, since matted fur, urine scald and arthritis pain often come with it.

Frequently asked questions

What are the levels of the chonk chart?

The meme has six: A Fine Boi, He Chonk, A Heckin' Chonker, Hefty Chonk, Megachonker and OH LAWD HE COMIN'. In vet terms that runs from a body condition score of 4 or 5 (ideal) up to 9 (severely obese). We add a seventh, off the left edge, for cats that are too thin, because the original chart leaves them out.

Is a Heckin' Chonker overweight?

Yes. A Heckin' Chonker matches a body condition score of 7, which is about 20% over ideal weight and roughly 30 to 34% body fat. It's the level where a vet will usually suggest a proper plan: a calorie target, measured meals and slow loss.

What does "OH LAWD HE COMIN'" mean?

It's the top level of the chonk chart and became a catchphrase for anything enormous heading your way. For a real cat it means a body condition score of 9, the top of the vet scale, with enough weight that moving and grooming are affected. It's the one level on the chart that needs a vet visit soon.

Is the chonk chart accurate?

The meme on its own isn't a measurement, and the body-fat percentages often attached to it online have no source. What makes this version useful is that each level is tied to the 9-point body condition score, and your cat is placed by what you feel, not by how fluffy they look.

How do I get my chonky cat to lose weight safely?

Slowly. Aim for 0.5 to 2% of body weight a week, which means months, not weeks. Measure every meal, keep treats to about a tenth of the day's food, and add short daily play. Never cut food drastically: a cat that stops eating can develop hepatic lipidosis. Our cat diet calculator turns a target weight into daily calories and portions.

Gear that helps a chonk get back to fine

The tool suggests a few products that fit your cat's level. Most of the work happens at the bowl, so start with the food: Dr. Anand's guide to the best cat food covers lower-calorie options, and an automatic cat feeder keeps portions fixed when a cat has learned that yelling at dawn gets results. For the exercise side, a wand from our best cat toys list and some climbing space from a sturdy cat tree burn calories a diet can't.

Methodology & sources

Chonk levels are a House of Mittens mapping, reviewed by Dr. Priya Anand, onto the 9-point feline body condition system. The score uses the same weighted model and descriptors as our body condition score tool (ribs 0.40, waist 0.25, side profile 0.20, belly pad 0.15), imported from the same code, so the two tools can't disagree. Body-fat bands come from the Association for Pet Obesity Prevention. Weight estimates use the WSAVA/AAHA convention that each point away from 5 is about 10% of body weight. An automated test runs on every build and checks every vet score against its chonk level, the top-level split, the weight maths and each figure quoted on this page.

Laflamme DP. Development and validation of a body condition score system for cats. Feline Practice 1997;25:13–18.
Bjornvad CR, Nielsen DH, Armstrong PJ, et al. Evaluation of a nine-point body condition scoring system in physically inactive pet cats. Am J Vet Res 2011;72:433–437.
Cline MG, Burns KM, Coe JB, et al. 2021 AAHA Nutrition and Weight Management Guidelines for Dogs and Cats. J Am Anim Hosp Assoc 2021;57:153–178.
WSAVA Global Nutrition Committee: Global Nutrition Guidelines (body condition score, cats)
Association for Pet Obesity Prevention: Cat Body Condition Scoring
Know Your Meme: Chonk / Oh Lawd He Comin' (origin of the chart)

Reviewed annually. About Dr. Anand · Last reviewed November 7, 2026.

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Anand, P. (2026, November 7). Cat Chonk Chart: Find Your Cat's Chonk Level. House of Mittens. https://houseofmittens.com/cat-chonk-chart/

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Cat Chonk Chart

Cat chonk chart tool: tap the cat that looks most like yours, then check by feel to place your cat on the chart with its veterinary body condition score.

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