Leopard Gecko Tank Size
Eublepharis macularius
The short answer: an adult needs 40 gallons — 36" × 18" × 18". Below is what to use at each stage, and why the enclosure type matters as much as the volume.
Baby
10 gal20" × 10" × 12"
Sufficient for hatchlings up to 4 months
Juvenile
20 gal30" × 12" × 12"
Growing geckos (4-10 months) need moderate space
Adult
40 gal36" × 18" × 18"
Ideal long-term home for adult leopard geckos
Enclosure type
Glass terrarium with screen top or low-profile PVC enclosure
What most people get wrong
Leopard geckos are ground-dwelling and don't require tall enclosures. Focus on floor space. Minimum of 3 hides required (warm, cool, moist). A 20-gallon long is acceptable for adults but 40-gallon is preferred.
Other species
Need to compare sizes side by side? Use the calculator.