Reptile Terrarium Size Calculator
Calculate the right terrarium size for your reptile.
Covers geckos, bearded dragons, ball pythons, and more.
Terrarium Requirements
Terrarium sizing depends on the reptile species, adult size, and activity level.
General rule for snakes: The enclosure length should be at least 2/3 of the snake’s adult length. Width should be at least 1/3 of the snake’s length.
General rule for lizards: Enclosure length should be at least 2× the lizard’s total length.
Minimum enclosure sizes (Length × Width × Height):
- Leopard Gecko: 36" × 18" × 18" (91 × 46 × 46 cm) — 40 gallon
- Crested Gecko: 18" × 18" × 24" (46 × 46 × 61 cm) — 20 gallon tall
- Bearded Dragon: 48" × 24" × 24" (122 × 61 × 61 cm) — 75 gallon
- Ball Python: 48" × 24" × 18" (122 × 61 × 46 cm) — 40+ gallon
- Corn Snake: 48" × 24" × 18" (122 × 61 × 46 cm) — 40+ gallon
- Blue Tongue Skink: 48" × 24" × 18" (122 × 61 × 46 cm)
Gallon to dimensions (approximate):
- 20 gallon long: 30" × 12" × 12" (76 × 30 × 30 cm)
- 40 gallon breeder: 36" × 18" × 16" (91 × 46 × 41 cm)
- 75 gallon: 48" × 18" × 21" (122 × 46 × 53 cm)