PetGuideCalc builds calculators from published husbandry standards and veterinary reference ranges. Every tool states its assumptions, units, and sources up front, so you can verify the math behind the result instead of taking it on faith.
Start with the essentials: the UVB calculator for reptile lighting distances, the snake starter guide, the aquarium fish compatibility checker, and the hamster cage size calculator. Every tool links the sources it uses.
Tools
Reptile UVB Calculator
Estimate the mounting distance and UV index for a T5 HO, T8, or compact UVB bulb across six common reptile species.
Snake Starter Guide
Enclosure size, temperature gradient, and humidity targets for ball pythons and corn snakes, compared side by side.
Aquarium Fish Compatibility Checker
Compatibility verdicts with reasons for 12 common freshwater community fish, based on temperature and temperament rules.
Hamster Cage Size Calculator
Minimum and recommended floor areas for Syrian and dwarf hamsters, with cm/in conversion and shortfall guidance.
Frequently asked questions
What is PetGuideCalc?
PetGuideCalc is a collection of free calculators and short care guides for reptile and aquarium keepers. Each tool states its assumptions, units, and sources so you can verify the math behind the result.
Are the calculators really free?
Yes. No accounts, no paywalls, and no data collection beyond basic site analytics. The calculators exist to make evidence-based husbandry easier to apply.
Where do the values come from?
Published husbandry standards and veterinary reference ranges, such as UVB exposure guides, enclosure size recommendations, and stocking rules. Every calculator links the sources it uses.
Can I use these results instead of a veterinarian?
No. The calculators are educational planning tools, not medical advice. If you have health concerns about your pet, consult a qualified reptile or exotic-animal veterinarian.