This tool provides a general estimate and does not replace professional veterinary advice.
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What is the Leopard Gecko Prey Size Calculator?
The Leopard Gecko Prey Size Calculator calculates correct feeder insect or prey size relative to leopard gecko 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.
Leopard geckos generally live 15-20 years when they are well looked after. As an insectivore, what a leopard gecko needs from its diet changes across its life stages. A single adult needs at least a 90x45cm floor area with a warm hide around 32C, a cool hide, and a humid hide to help shedding. Belly heat from a mat with a thermostat matters more than overhead heat. The usual suspects for this species are metabolic bone disease, retained shed on toes and eyes, impaction from loose substrate, so any noticeable change is worth following up.
Leopard Gecko quick facts
| Measure | Leopard Gecko |
|---|---|
| Typical lifespan | 15–20 years |
| Adult weight | 1.6–3.2 oz (45–90 g) |
| Diet | Insectivore |
| Mature at | About 1 years |
| Egg incubation | 35–60 days |
| Clutch size | 1–2 eggs |
| Humidity | 30–40% |
How does the Leopard Gecko 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 leopard geckos. Treat the result as a well-founded estimate. Every leopard gecko is an individual, and your vet's judgement outranks any online tool.
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 Leopard Gecko 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
If two people care for your leopard gecko, agree on one method and stick to it. Half of all confusing results come from measuring differently each time.
For related questions, see the other nutrition tools or browse every leopard gecko tool.
Before you rely on this
Two leopard geckos with identical numbers on paper can still need different care. Breed or line, body condition, activity level and any existing health conditions all pull the real answer away from the average. If your leopard gecko has a diagnosed condition, is pregnant, or is very young or very old, treat the figure here as the loosest of guides and let your vet set the actual target.
Sources and references
The formulas, reference ranges and species data behind the Leopard Gecko 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.
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