How Many Mealworms to Feed a Leopard Gecko

How many mealworms to feed leopard gecko adults? Common practice is 3 to 5 per feeding, as part of a mixed meal. Mealworms are a supporting feeder, high in fat and very low in calcium.

This page covers mealworm amounts by age, their nutrition, and how to dust, serve and store them. For the full feeding plan, see the leopard gecko diet guide.

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How Many Mealworms to Feed Leopard Gecko Hatchlings, Juveniles and Adults

No veterinary or university source gives a mealworm count for leopard geckos. What exists is a total insect count per feeding from a vet reviewed care sheet. Mealworm numbers below are common keeper practice built on that total, not sourced facts.

The meal schedule and total counts come from the Pets in the Classroom care sheet, which a veterinarian reviewed. The same sheet says each insect should be no wider than the gecko’s head.

An adult that eats mealworms alone on a 3 meal week would take in 18 to 30 of them. That is a lot of fat and very little calcium. The rest of the meal should be a better staple.

A simple rule for adults

Keep mealworms to about a third of the insects in any meal. Fill the rest with crickets or dubia roaches, which the care sheet lists as staples. That keeps the count in the sourced range of 6 to 10 and holds fat down.

Adjust to the gecko, not the table

Body condition matters more than any count. Merck notes that obesity with limited exercise can lead to hepatic lipidosis in reptiles. It is managed by gradual diet reduction, so if a gecko leaves insects behind, cut the count.

Are Mealworms a Staple for Leopard Geckos?

The vet reviewed care sheet names crickets and dubia roaches as staples. It says mealworms and superworms are high in fat and belong in moderation. Merck lists mealworms among commonly offered insects, which supports using them but not as a base diet.

Mealworms still earn a place. They are easy to store, they do not chirp or jump, and most geckos accept them. A rotation that includes them once or twice a week works for most adults.

Superworms are the closest alternative. Merck lists a higher Ca:P of 0.43 for superworms than for mealworms at 0.11, though both are low. Our feeder insects guide compares the full range.

Mealworm Nutrition for Leopard Geckos

Merck’s reptile husbandry chapter lists whole mealworms with the composition below. The table is for mealworms (Tenebrio) in general and is not specific to leopard geckos. Merck does not state the larval stage or what the insects were fed.

Two numbers matter most. Fat at 35 percent makes mealworms energy dense, so overfeeding adds weight quickly. A Ca:P of 0.11 means a mealworm based diet supplies far more phosphorus than calcium unless the insects are dusted.

Merck names a low Ca:P diet, vitamin D3 deficiency, lack of UVB and poor heat as causes of metabolic bone disease in reptiles. That is general reptile information, but it explains why a mealworm heavy diet is risky for a growing gecko.

What about chitin?

Mealworms have a hard shell made largely of chitin, a tough fiber. Feedipedia, the FAO and INRAE feed database, cites chitin at 21.7 to 22.7% of dry matter in fresh 8 to 12 week old larvae. That is roughly a fifth of the dry weight, more than most soft bodied feeders carry.

No opened source says how well leopard geckos digest that chitin. The figure is from feed science, not from a gecko trial.

As common keeper practice, choose mealworms smaller than the head width and skip very large, dark ones, which carry the most shell. See a reptile veterinarian if a gecko strains to pass stool after a mealworm heavy week.

Dusting and Gut Loading Mealworms

Merck advises dusting insects with a high calcium supplement, such as calcium carbonate, immediately before feeding. This matters more for mealworms than for most feeders, since their own calcium is so low. The care sheet adds that plain calcium suits most meals, with D3 once or twice a week depending on UVB exposure.

Product picks are on our calcium supplement guide. Dust in a small cup by shaking a few mealworms with a light coating, then serve them right away. The RSPCA also advises a bowl of plain calcium powder in the enclosure at all times.

Gut loading means feeding insects a nutritious diet before they are eaten. In a 2025 study of Blaptica dubia, adults on a high calcium diet for 1 day rose from a Ca:P of 1.6 to 5.1. That study used roaches, not mealworms or leopard geckos.

Mealworms themselves respond to a calcium rich diet. Feedipedia reports that the calcium content and Ca:P ratio of mealworms can be raised by feeding a calcium fortified diet for 1 to 2 days, that a diet with 8% calcium carbonate was found suitable, and that 72 hours on a fortified commercial diet gave acceptable calcium for the next 24 hours.

So the practical routine is a calcium fortified feed for two to three days before a meal, then dusting on top. The gut loading guide covers the method. Oats or bran with a slice of vegetable keep the larvae alive but add little calcium, which is why the fortified feed matters.

How to Serve Mealworms Safely

Mealworms burrow into loose substrate, so serve them in a dish with smooth sides. A smooth sided feeder dish that mealworms cannot climb lets you count what is eaten.

• Offer them in the evening, when the species is active, since it is nocturnal.
• Use long feeding tongs with soft tips for fussy feeders.
• Remove uneaten mealworms after the meal. The RSPCA care sheet says uneaten bugs should be removed to prevent them biting the gecko.
• Never feed wild caught insects, which may carry pesticides or parasites.

Offer mealworms alive, since a nocturnal hunter responds to movement. Rotate them with other feeders instead of repeating one insect all week.

When Mealworm Amounts Go Wrong

Too many mealworms show up as weight gain and food refusal at the next meal. The fix is a smaller count and more staples, not fasting.

Too few mealworms is rarely a problem, since other feeders fill the gap.

A gecko that loses weight needs more total food, whatever the insect. Weigh it monthly with a kitchen scale. In Hynes (2012), juvenile leopard geckos on a low food diet put tail regrowth ahead of body growth.

See a reptile veterinarian if your gecko shows a swollen jaw, tremors or weak legs. Merck lists these among signs of metabolic bone disease. It says prognosis is favorable when the animal is still eating.

Frequently Asked Questions

How many mealworms to feed leopard gecko hatchlings?

Common keeper practice is 2 to 3 very small mealworms per daily meal, mixed with other feeders. The care sheet gives no hatchling count, so base the total on how readily the gecko eats. Hatchlings are about 85 mm long, per Animal Diversity Web, so insects must be small.

Can a leopard gecko eat mealworms every day?

Juveniles eat daily, but mealworms should not be the daily food. Their fat content and low calcium make them a rotation item. Vary the meal with crickets or dubia roaches.

Should mealworms be dusted with calcium?

Yes. Merck advises dusting insects immediately before feeding, and mealworms need it most. Dust only the portion eaten in that meal.

Are mealworms or superworms better?

Merck lists a Ca:P of 0.43 for superworms and 0.11 for mealworms. Neither is a staple, and superworms are better on that measure alone. Both are high in fat according to the care sheet.

Can a leopard gecko choke on a mealworm?

Size is the main risk. Keep each insect no wider than the gecko’s head, as the care sheet advises. If a gecko seems unable to swallow one, remove it and offer a smaller one.

How long can mealworms be stored?

No opened source gives a storage time for mealworms. As common keeper practice, they are kept in a ventilated container of oats or bran in a cool place. Discard any that turn dark or die.