Bearded Dragon Care Calculator

Bearded Dragon Care Guide

What do I need to know about Temperature Requirements?

Bearded dragons are from arid Australia and require a strong thermal gradient. Basking spot: juveniles 38-42°C, adults 40-42°C — essential for digestion. Digestion stops below 35°C and food rotates undigested, causing bacterial infection (impaction). Cool side: 25-30°C — allows thermoregulation. Night temperature: minimum 18°C (above 15°C is acceptable short-term). Measure with a digital probe thermometer AT the surface of the basking spot, not the air temperature — surface and air temperatures can differ by 10°C or more under the same lamp.

What should I know about UVB Lighting — Non-Negotiable?

Bearded dragons require high-intensity UVB to synthesise vitamin D3 for calcium metabolism. Without adequate UVB: metabolic bone disease (MBD) — soft, rubbery bones that fracture, permanently deformed limbs, seizures, death. It is the most common preventable disease in captive reptiles. Recommended UVB: Arcadia Dragon 12% T5 HO or Exo Terra Solar Extreme 12% T5. Distance from bulb (T5 HO 10-12%): basking site should be 25-40cm from the bulb. Replace UVB bulbs every 6-12 months — they lose UVB output well before the visible light dims, so a bulb can look fine while providing little to no actual UVB.

What should I know about Feeding by Life Stage?

Hatchlings and juveniles (0-12 months): 70-80% insects, 20-30% vegetables. Feed insects 2-3 times daily (as many as they will eat in 10 minutes). Dust every feed with calcium (without D3), every other feed with a multivitamin. Adult (18+ months): 70-80% leafy greens, 20-30% insects. Feed greens daily, insects 2-3 times per week. Best insects: black soldier fly larvae (highest calcium-to-phosphorus ratio), dubia roaches, crickets. Avoid waxworms and mealworms regularly (high fat). Best greens: collard greens, mustard greens, and dandelion greens are excellent calcium-rich staples that should form the bulk of a bearded dragon's vegetable intake.

What should I know about Common Husbandry Mistakes?

Under-sized enclosure: adults need minimum 120×60×60cm, ideally 150×60×60cm. Beardies grow up to 50-60cm and are active during daylight. Cohabitation: males are territorial and will fight — even females can be stressed together. Keep singly. Wrong substrate: loose sand causes impaction in juveniles (sand impaction is life-threatening). Use ceramic tile, slate, or paper for juveniles. Adult beardies on sand: large particle reptile sand only, not builders sand or calcium sand. Inadequate hide: a cramped or exposed hide leaves a dragon feeling constantly vulnerable, which can lead to chronic stress even when every other husbandry element is correct.

Why Do Bearded Dragons Need Such a Specific Temperature Gradient Rather Than One Set Temperature?

As ectothermic (cold-blooded) reptiles, bearded dragons cannot generate their own body heat and instead regulate their internal temperature behaviourally by moving between warmer and cooler zones within their enclosure — this is why a correctly set up enclosure provides a gradient (commonly a basking spot around 38-42°C, a cooler end around 24-27°C, with a gradient in between) rather than a single uniform temperature throughout. This gradient allows the dragon to self-select the temperature it needs for whatever physiological process is currently most important — basking to raise body temperature for digestion after eating, moving to the cool end to avoid overheating, or seeking an intermediate zone for general activity — and a dragon kept in an enclosure without this choice (either uniformly too warm or too cool, or lacking a properly distinct basking zone) cannot thermoregulate effectively, which impairs digestion, immune function, and overall activity level even if the 'average' enclosure temperature looks reasonable on a single thermometer reading.

How Does Diet Composition Need to Shift as a Bearded Dragon Ages?

Juvenile bearded dragons have proportionally higher protein needs to support rapid growth and are generally fed a diet weighted more heavily toward insects (commonly 70-80% insects to 20-30% vegetation for young dragons), while adult bearded dragons need this ratio substantially reversed, generally toward 20-25% insects and 75-80% vegetation, because adult growth has slowed dramatically and excess animal protein in adulthood is associated with increased risk of kidney problems and obesity in captive dragons. This shift needs to happen gradually over the animal's first one to two years as growth rate naturally slows, rather than abruptly, and failing to reduce insect proportion as the dragon matures into adulthood is a commonly cited husbandry mistake that can contribute to obesity and metabolic problems in adult pet bearded dragons that were correctly fed as juveniles but never transitioned to an adult-appropriate ratio.

What should I know about Metabolic Bone Disease — Prevention and Early Signs?

Metabolic bone disease (MBD) is one of the most common and serious health problems in captive bearded dragons, caused by inadequate UVB exposure, insufficient dietary calcium, or an imbalanced calcium-to-phosphorus ratio in the diet that prevents proper calcium absorption and bone mineralization. Early signs include a soft or rubbery jaw, swollen or bowed limbs, lethargy, and reluctance to move or bear weight normally, and the condition can progress to fractures or an inability to walk if left untreated. Prevention centers on three consistent factors: proper UVB lighting replaced on the manufacturer's recommended schedule (UVB output declines well before visible light does), calcium supplementation (often dusted on feeder insects), and appropriate vitamin D3 levels to help the body actually use that calcium. Because MBD develops gradually, subtle early changes in a bearded dragon's gait or jaw firmness are worth checking promptly rather than waiting for obvious deformity.

Worked Example: Setting Up a Juvenile Temperature Gradient

A bearded dragon enclosure needs a temperature gradient rather than one uniform temperature, because the animal relies on moving between a hot basking area and a cooler zone to regulate its own body temperature (thermoregulation), something it cannot do internally the way mammals can.

Worked example: for a juvenile bearded dragon's enclosure, a basking bulb positioned to create a surface temperature of around 40°C (104°F) directly under the light, measured with a digital probe thermometer rather than estimated by hand or with a cheap stick-on dial thermometer (which are notoriously inaccurate), while the opposite end of the enclosure should sit naturally cooler, around 26°C (79°F), giving the dragon somewhere to retreat to and cool down. Juveniles are generally kept slightly warmer than adults at both ends of this gradient to support their faster growth and more active metabolism, with the gradient narrowed gradually as the dragon matures into adulthood.

How Often Should UVB Bulbs Be Replaced?

Unlike a standard light bulb, a UVB bulb's visible light output can continue for far longer than its actual UVB output remains effective, which means a bulb that still looks bright and is still working for the basking/heat side of the enclosure may no longer be providing meaningful UVB radiation at all. Most reptile-specific UVB tubes are recommended to be replaced roughly every 6-12 months (commonly every 6 months for compact/coil UVB bulbs, and up to 12 months for some linear fluorescent tubes), regardless of whether the bulb still appears to be working normally, because UVB output specifically degrades faster than visible light output. Since UVB exposure is what allows a bearded dragon to synthesise vitamin D3 and properly absorb dietary calcium, an expired UVB bulb left in place well past its replacement window is a realistic contributing cause of the metabolic bone disease referenced above, even in an owner who is otherwise feeding and heating the enclosure correctly.

Why Do Bearded Dragons Sometimes Stop Eating for Extended Periods?

Bearded dragons naturally undergo a seasonal slowdown response related to shortening daylight and temperature cues, sometimes called "winter down" or semi-dormancy, during which a healthy adult can reduce food intake substantially or appear less active for a period of weeks, distinct from true hibernation but similarly triggered by environmental cues even in an indoor enclosure with artificial lighting. This is generally considered a normal seasonal pattern in otherwise healthy adults with stable husbandry, rather than automatically a sign of illness, though any sudden appetite loss should still be assessed carefully against other possible causes — including incorrect temperatures, impaction, parasites, or underlying illness — particularly in juveniles, which should not show the same extended slowdown pattern and whose appetite loss is more likely to indicate a genuine husbandry or health problem needing prompt attention.