About this calculator

Rule of thumb: 1 W of basking heat per litre of vivarium volume for desert species (bearded dragon, uromastyx); 0.5 W/L for tropical (crested gecko). UVB tube should span ⅔ of enclosure length; T5 HO 12% UVB for desert, 6% for tropical, replace every 12 months.

Frequently asked questions

What does the Vivarium Heat & UV Calculator do?

Basking-lamp wattage and UVB tube length for a reptile enclosure by species and vivarium volume. Rule of thumb: 1 W of basking heat per litre of vivarium volume for desert species (bearded dragon, uromastyx); 0.5 W/L for tropical (crested gecko). UVB tube should span ⅔ of enclosure length; T5 HO 12% UVB for desert, 6% for tropical, replace every 12 months.

Is the Vivarium Heat & UV Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Vivarium Heat & UV Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified reptile vivariums professional before committing to a purchase or a job.

What inputs does the Vivarium Heat & UV Calculator need?

Enter values for: Length (cm), Width (cm), Height (cm), Species type. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Vivarium Heat & UV Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.