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Reptile Habitat UVB Calculator

Find the right lamp-to-basking-site distance from the Ferguson zone, the lamp type and the screen mesh, with the UV index each zone targets.

Related tools

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Aquarium Heater Wattage CalculatorFind the heater wattage your tank needs from its volume, the target water temperature and the coldest room temperature.Aquarium Substrate CalculatorWork out how much gravel, sand or aqua soil your tank needs from its shape, footprint and the substrate depth you want.Bird Cage Size CalculatorMinimum cage dimensions and safe bar spacing for eleven species, from finches to macaws, in inches and centimetres.Cat Calorie CalculatorDaily calorie needs from RER = 70·kg^0.75 and a life-stage factor, with optional cups per day.Cat Litter Box CalculatorHow many litter boxes you need (n+1, one per floor), how big each one should be, and what the litter costs you every month.Chocolate Toxicity CalculatorEstimate a dog's methylxanthine dose in mg/kg against common vet risk bands. Not veterinary advice.Dog Life Expectancy CalculatorEstimate a dog's lifespan from breed, size and health-and-care factors.Dog Pregnancy CalculatorEstimated whelping date and stage from the mating date — canine gestation is about 63 days.

Open Reptile Habitat UVB Calculator and you get an answer straight away, with no account to create. It sits under Pets & animals in our catalogue, alongside Aquarium Heater Wattage Calculator and Aquarium Substrate Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Reptile Habitat UVB Calculator?

Find the right lamp-to-basking-site distance from the Ferguson zone, the lamp type and the screen mesh, with the UV index each zone targets.

When would I actually use this?

Day-to-day care: how much to feed at a given weight, whether a size is right for the breed, and what a life stage means in human terms.

What is the most common mistake?

Using the seven-years rule for a dog's age. Ageing is fast in the first two years and then slows, and it slows much more for a small breed than for a large one — the multiplier is not a constant.

How is Reptile Habitat UVB Calculator different from Aquarium Heater Wattage Calculator?

They sit next to each other but answer different questions: Aquarium Heater Wattage Calculator is the one to open when you need it to find the heater wattage your tank needs from its volume, the target water temperature and the coldest room temperature. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Aquarium Substrate Calculator is the closest one after this: Work out how much gravel, sand or aqua soil your tank needs from its shape, footprint and the substrate depth you want.

What else is worth having open alongside it?

Bird Cage Size Calculator and Cat Calorie Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Portions follow published feeding guidelines by species and weight; age equivalences use the size-dependent curves rather than a flat multiplier. None of this replaces a veterinarian, especially for an animal that is unwell.

Further reading

All guides →
How-toThe IATA Crate Formula an Airline Measures at Check-InLength A + half B, width twice C, height D. The width rule is the one that fails people: a dog with 28 cm shoulders needs 56 cm of interior width, and no crate sold by weight rating tells you that.How-toHow Much Substrate Does an Aquarium Need? Depth, Weight and Grain SizeThe depth follows the job: a bare display, a planted tank whose roots need room, an under-gravel plate. Then comes the number people are unprepared for — substrate is what puts a filled tank past what a piece of furniture can hold. Plus why fine sand compacts and coarse gravel traps waste.ExplainerHow Many Fish Can a Tank Hold? The Inch-per-Gallon Rule Is WrongEvery stocking calculator implements a length-per-volume rule, and waste output scales with body mass, not length. A fish twice as long makes nearly five times the ammonia. Run through the tool's five methods, the same tank comes back holding anywhere from 6 to 12 fish.How-toWhat Wattage of Heater Does an Aquarium Need? Volume Is Only Half the AnswerThe same tank needs a 100 W heater in a warm flat and 300 W in an unheated room. The variable is the gap between the water and the room, which most rules of thumb drop entirely. Plus why two smaller heaters beat one big one, and where this calculator's recommendation stops being trustworthy.ExplainerHow Much Chocolate Is Toxic to Dogs? Dose by Type and Body WeightCall a vet first, then read this. Toxicity depends on the theobromine dose in milligrams per kilogram of dog: dark chocolate is nearly three times worse than milk chocolate by weight, baking chocolate seven times and dry cocoa powder thirteen times. Here is the table by type and dog weight.How-ton + 1 Litter Boxes, and What the Litter Actually CostsTwo cats need three boxes, not two, and each should be one and a half body lengths long — 69 cm for an average adult. The litter figure that follows is larger than most people expect, and knowing why is the useful part.