Reptile Enclosure Sizing Calculator

Minimum dimensions from species and adult size.

Inputs

Snout-to-vent length (in)

Activity type (0-3)

Number of animals

Safety margin

%

Tab to move between fields

Results

Min length (in)

21.6

Min width (in)10.8

Min height (in)7.2

Volume (gallons)7.3

Floor area (sq ft)1.62

How to Use This Calculator

Enter Snout-to-vent length (in), Activity type (0-3), and Number of animals.
Set Safety margin.
Review the Min length (in) result.
Use Min width (in) and Min height (in) to inform your decision.

How the result changes with Snout-to-vent length (in)

Snout-to-vent length (in)	Min length (in)
13	23.4
43	77.4
78	140.4
108	194.4

What each input means

Snout-to-vent length (in): Adult snout-to-vent length of your reptile in inches.
Activity type (0-3): 0 = terrestrial, 1 = semi-arboreal, 2 = arboreal, 3 = aquatic/semi-aquatic.
Number of animals: Number of animals housed together. Each additional animal adds ~50% floor area.
Safety margin: Extra space beyond bare minimum (20% recommended for comfort).

What each result means

Min length (in): Minimum enclosure length in inches.
Min width (in): Minimum enclosure width in inches.
Min height (in): Minimum enclosure height in inches.
Volume (gallons): Approximate enclosure volume in US gallons.
Floor area (sq ft): Usable floor area in square feet.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Snout-to-vent length (in) = 12, Activity type (0-3) = 0, Number of animals = 1, Safety margin = 20 = 4 input(s) provided
Calculate Min length
Min length = baseLength * floorMultiplier * margin
21.6 = 21.6
Calculate Min width
Min width = baseWidth * floorMultiplier * margin
10.8 = 10.8
Calculate Min height
Min height = baseHeight * margin
7.2 = 7.2

Engine last updated July 28, 2026. Checked against 2 independently-derived tests — how we verify calculators.

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