Short answer: One adult leopard gecko needs an enclosure of at least 36 × 18 × 18 inches, with at least 4.5 square feet of floor. ReptiFiles says the 10 and 20 gallon tanks often recommended are too small for permanent housing. Leopard geckos live on the ground, so floor space matters most, and bigger is always better if it is laid out well.
Written from the cited care and veterinary sources below. No AI-written care advice.
Read the dimensions, not the gallons
Tanks are sold by volume, and two tanks with the same number of gallons can have very different floors. What a leopard gecko needs is floor: 36 inches long and 18 inches deep, at least 4.5 square feet. Height of 18 inches leaves room for décor and a heat lamp above.
| Enclosure | Enough for one adult? |
|---|---|
| 10 or 20 gallon | No: too small for permanent housing |
| At least 36 × 18 × 18 in (4.5 sq ft floor) | Yes: the minimum |
| Larger | Better, as long as it is laid out well |
What goes in it
A warm end with the basking spot (90–95°F), a cool end (72–77°F), at least three hides including a humid hide, and something to climb. Every number and source is on the leopard gecko care sheet.
Enter your tank's inside dimensions to check itOpen the calculator →Questions
Is a 20 gallon tank big enough for a leopard gecko?
Is a 40 gallon tank big enough for a leopard gecko?
Can a baby leopard gecko live in a big tank?
Sources
General information, not veterinary advice. To find a reptile vet, use the ARAV directory. Updated November 9, 2026.