How Big Do Leopard Geckos Get?
Leopard geckos reach 7 to 10 inches with about half of that being tail, at 50 to 90 grams. The commonly published adult enclosure of 36 by 18 by 18 inches is much larger than the tanks they were sold with for years.
Published adult size figures
| Figure | Value | Notes |
|---|---|---|
| Adult | 7-10 in total length | Roughly half of it tail |
| Weight | 50-90 g | Adult range |
| Hatchlings | 3-4 in | At emergence |
Checked September 20, 2026 against the sources at the foot of this page. Where sources differ the range is shown rather than averaged.
Getting there
Hatchling to adult in 9 to 12 months
Fast by lizard standards, so the adult enclosure is needed within the first year.
Males slightly larger
The difference is modest and does not change the housing requirement.
What that size means in practice
36 by 18 by 18 inches for one adult
The commonly published minimum, and considerably larger than the 10-gallon tanks leopard geckos were sold with for years.
A thick tail is the body-condition gauge
Leopard geckos store fat in the tail. A tail roughly as wide as the neck is healthy; a thin one indicates malnutrition or illness.
Common questions
How big do leopard geckos get?
Adults reach 7 to 10 inches in total length, roughly half of which is tail, weighing 50 to 90 grams. Males run slightly larger than females.
How big a tank does a leopard gecko need?
A commonly published minimum of 36 by 18 by 18 inches for one adult. That is substantially larger than the 10-gallon tank that was standard pet-store advice for years.
Why is my leopard gecko's tail fat?
That is healthy. Leopard geckos store fat in the tail, and one roughly as wide as the neck indicates good condition. A thin tail is the warning sign.