The Chonkometer's chubby orange tabby mascot, content and mid-purr

Step on the Chonkometer.

A fictional needle-gauge, an honest number, and a chubby cat who reacts to your reading. The maths is real and reviewed by a movement scientist; the tone is kind. We roast the absurd little gauge — never you.

⚖️BMI Chonkometer

The classic. Height and weight in, chonk level out — with an optional recalibration if you lift.

Most popular →
📏Body-Fat Calculator

Skinfold calipers and published equations that see past BMI to what your weight is actually made of.

Most accurate →
🧵Waist Circumference

One tape measure, sex-specific thresholds, and the fat that matters most metabolically.

Just a tape →
🍑Waist-to-Hip Ratio

Where you carry weight, not just how much. Apple vs. pear, quantified.

Shape matters →
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What the Chonkometer is (and isn't)

The Chonkometer is a small family of body-composition calculators that dress up real screening maths in a friendlier costume. Each tool takes a measurement or two, runs a published formula entirely in your browser, and hands back a "chonk level" — a playful label attached to an honest number. The cat mascot gets rounder or leaner with the result, the needle swings, and you get something worth screenshotting.

Underneath the jokes, the numbers are defensible. BMI uses the WHO categories. The body-fat tool implements peer-reviewed skinfold equations. Waist and waist-to-hip use established, sex-specific risk thresholds. Where a measure is known to be flawed — BMI and muscle being the famous example — we say so plainly and, where we can, offer an honest adjustment rather than pretending the number is the whole truth.

Kind by design

Body numbers are sensitive, so the Chonkometer has one firm rule: it roasts the ridiculous gauge and never the person standing on it. There are no jokes about worth, looks, or character. The underweight reading is gentle and never mocks thinness. And at the top of the scale, the machine drops the comedy entirely, shows its most caring face, and points you toward a real conversation with a doctor. A calculator should be able to be fun without being cruel.

Pick a gauge

New here? Start with the BMI Chonkometer — it's the fastest reading and needs nothing but your height and weight. If you lift or want the real picture of fat versus muscle, the body-fat calculator is the honest one. Short on equipment? A single waist measurement is one of the most useful cheap screens there is, and the waist-to-hip ratio adds where you carry it.

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