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Tarantula Environment Calculators and Tools

These tools check the conditions your tarantula lives in: temperature and humidity ranges, lighting distances, heater sizing and other habitat numbers. All 2 are free, quick and based on tarantula reference data.

Environment2 tools

All 2 tarantula environment tools

Tarantula Environment tools: what they help with

These tools check the conditions your tarantula lives in: temperature and humidity ranges, lighting distances, heater sizing and other habitat numbers. Many tarantulas cannot regulate their own body temperature or humidity. When the enclosure is off, health problems follow, often slowly enough that they are missed.

What to know about environment and habitat conditions for tarantulas

Terrestrial species need more floor space than height, with substrate deep enough to burrow and no more than 1.5 times their leg span of climbing room, since a fall can rupture the abdomen. Target humidity is around 65-75%.

Tarantula quick facts

Reference values for tarantulas from the species data behind this tool.
MeasureTarantula
Typical lifespan10–25 years
Adult weight0.7–5.3 oz (20–150 g)
DietInsectivore
Mature atAbout 3 years
Clutch size50–2000 eggs
Humidity65–75%

A practical tip

Measure with a digital thermometer and hygrometer at the animal's level, not near the heat source. Readings a few centimetres apart can differ a lot.

Other tarantula topics

Most questions lead to another. You may also find these useful: tarantula age tools, tarantula behavior tools, tarantula breeding tools and tarantula cost tools. Or see every tarantula tool in one place.

Environment tools for other pets

The same kind of tool exists for other species, each using that animal's own reference data: scorpion environment, hermit crab environment, land crab environment and snail environment.

Frequently asked questions

What temperature does a tarantula need?

It depends on the species and on whether you are measuring the warm or the cool end of the enclosure. The tarantula environment tools give the reference range and check your own readings against it.

What humidity does a tarantula need?

Aim for about 65–75% relative humidity.

Which tarantula environment tool should I use first?

Most people start with the Tarantula Humidity Level Checker, the most used tool in this group. If your question is more specific, the list above describes what each of the 2 tools does.

How accurate are the results?

They are estimates based on published reference data for tarantulas, and each tool lists its sources. Individual animals vary, so treat results as a guide and check health decisions with your vet.