Free tool · assess, don't guess

Is it too fat, or too thin?

"Is my reptile overweight?" is one of the most-asked keeper questions — and one of the easiest to misjudge by eye, because every body type carries weight differently. Pick your animal.

New to this? Read the companion guide —Is my reptile overweight or underweight? — for what healthy, fat and thin look like on every body type (and why pet-store verdicts often mislead), then use this checker for your animal.

Your reptile:

Quick answers

How do I tell if my reptile is overweight or underweight?

Judge it by body type, not by eye alone — every reptile carries weight differently. Pick your species above and the tool shows the tell that matters for it: a leopard gecko’s tail should be a plump “carrot”, a snake’s cross-section a rounded loaf (not a sharp “Toblerone” spine), a tortoise is judged by weight-for-size and its leg openings, and a chameleon by its flanks and eyes. Answer one question and you’ll get a verdict plus how to fix it.

What’s the best way to track my reptile’s weight?

Weigh it on a digital kitchen scale weekly and track the trend over time — that trend line tells you far more than any single number or a glance. A steady, unexplained drop is an early warning; healthy growth or a stable adult weight is reassuring. It’s the single best husbandry habit for spotting problems early.

My leopard gecko’s tail looks thin — is that bad?

The tail is a fat store and a great health gauge. A healthy leopard gecko (or fat-tailed gecko) has a plump tail roughly as wide as its neck; a thin “pencil” tail means it isn’t eating enough or may be unwell, and a tail wider than the body with armpit “bubbles” is overweight. A persistently thin or shrinking tail with weight loss warrants a reptile vet.

Should I put my reptile on a diet if it’s overweight?

Adjust gradually, never crash-diet — pick your species above for its specific fix, which usually means right-sizing feeder portions and frequency and improving activity, not starving it. Feed to body condition, not to begging. If weight loss is rapid or unexplained rather than something you’re managing, that’s a vet visit, not a diet.

The single best habit: weigh your reptile on a kitchen scale weekly and track the trend. Kind, general guidance from The Baskden Team — not a diagnosis. Rapid, unexplained weight loss → reptile vet.