This tool provides a general estimate and does not replace professional veterinary advice.
Updated · How we check our tools
What is the Bearded Dragon Prey Size Calculator?
The Bearded Dragon Prey Size Calculator calculates correct feeder insect or prey size relative to bearded dragon head size. Overfeeding is one of the most common and most preventable health problems in pets, while underfeeding a growing or active animal can slow development or sap energy.
Bearded dragons generally live 8-12 years when they are well looked after. As an omnivore, what a bearded dragon needs from its diet changes across its life stages. Adults need a 120x60x60cm enclosure with a basking surface around 40C, a cool end near 24C, and a strong linear UVB tube. Loose sand is a common impaction risk for juveniles. The usual suspects for this species are metabolic bone disease from inadequate UVB, impaction, atadenovirus, so any noticeable change is worth following up.
Bearded Dragon quick facts
| Measure | Bearded Dragon |
|---|---|
| Typical lifespan | 8–12 years |
| Adult weight | 0.7–1.3 lb (0.3–0.6 kg) |
| Diet | Omnivore |
| Mature at | About 1.25 years |
| Egg incubation | 55–75 days |
| Clutch size | 15–30 eggs |
| Humidity | 30–40% |
How does the Bearded Dragon Prey Size Calculator work?
The estimate starts from a resting-energy formula based on body weight, then adjusts for activity level, life stage and, where relevant, the specific nutritional profile of bearded dragons. Use it to know roughly where you stand and what to ask about, not to rule anything in or out on its own.
Factors that matter
- Body weight: the single biggest driver of daily calorie needs
- Activity level: a sedentary indoor animal needs meaningfully less than an active or working one
- Life stage: since growing, pregnant or nursing animals need more energy per kilogram than a stable adult
- Spay/neuter status: which typically lowers metabolic needs somewhat
How do you use the Bearded Dragon Prey Size Calculator?
- Enter the body weight in whichever unit you use (lb, oz, kg)
- Pick your activity level (Low, Moderate, High)
- Enter the calories per cup of your food
- Press Calculate, then read the result alongside the sources listed below
Use this alongside your own observation, not instead of it. You notice changes in your bearded dragon that no calculator can pick up.
For related questions, see the other nutrition tools or browse every bearded dragon tool.
Before you rely on this
Averages hide a lot of variation. The figure here reflects what is typical for bearded dragons, but your bearded dragon may sit well outside it for perfectly ordinary reasons. Use the result to spot changes over time in your own animal rather than to compare it against other people's pets.
Sources and references
The formulas, reference ranges and species data behind the Bearded Dragon Prey Size Calculator come from these veterinary references, professional bodies and published research.
- wsava.orgWSAVA Global Nutrition Guidelineswsava.org(opens in a new tab)
- Merck Veterinary ManualReptilesmerckvetmanual.com(opens in a new tab)
- ARAVAssociation of Reptilian and Amphibian Veterinariansarav.org(opens in a new tab)
- Merck Veterinary ManualRoutine Care and Breedingmerckvetmanual.com(opens in a new tab)
- Built on veterinary referencesFormulas and ranges come from veterinary manuals, university research and welfare bodies, listed above for you to check.
- Instant resultsNo page reload, no waiting and no account. Enter your details and the result appears straight away.
- Private by designCalculations run in your browser. Nothing you enter is stored on our servers or shared with anyone.
- Always freeEvery XpertsPet tool is free to use, with no premium tier and nothing to sign up for.