Their full grown size is determined by genetics, sex, environment, diet and health.

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Healthy babies grow at a rate of 1 to 3″ per month.

An adult will be fully grown at 12 months of age. Bearded Dragons should measure anywhere from 16 to 24 inches in length and weigh 380 to 510 grams.

Most of their size comes from their tail. Their tail is at least the same length as their body – if not longer.

Forecasting the adult size of your baby dragon can be difficult. But, you can use a juvenile’s growth rate to get an accurate guesstimate (more on this later).

So let’s take a closer look at how big do bearded dragons get and how to accurately guesstimate their size whilst still juveniles…

An adult’s bearded dragon size will measure anywhere from 16 to 24 inches and weigh 380 to 510 grams.

Any Bearded Dragon over 510 grams is considered obese.

When monitoring their weight you should make sure there is not sudden weight gain or loss. Changes in weight can be a sign of illness.

It is important to keep lizards a healthy weight. Excess fat can lead to prolapses and organ diseases.

How Can I Tell If My Bearded Dragon Is Overweight

Fat species will have a bulged belly that overextends beyond its sides when standing. They will also have very thick legs and a plump chest area.

If only the belly is enlarged (and your beardie is female) she may have egg retention and require surgery.

If your bearded dragon is overweight you should start by checking their tank temperature. If the basking spot is much greater than 95 to 100℉ they may be hungrier than they should be.

Many full grown adults become obese because of an overly affectionate owner who overfeeds them.

You can help your Beardie to lose weight by changing their diet:

Increase the ration of greens to insects – adults only need insects three times a week.Select less fatty and more protein-heavy insects – avoid superworms and choose hornworms.

Finally, you can increase their exercise and enrichment:

Try and make them exercise for their meals – put insects far away when feeding.Take them outside and use a play pen.

How Can I Tell If My Bearded Dragon Is Underweight

An underweight or skinny Beardie will have a flat body with wrinkled, loose skin. Their normal “fat pads” on the backs of their legs and skull will be sunken too.

You will be able to see their spine and ribs.

For baby bearded dragons you should track their weight gain to a growth chart.

If they are underweight follow the steps below:

Observe their appetite. If they are eager to eat then get a fecal exam as they may have parasites.If they stop eating completely then they may be suffering from impaction. This is a common issue for pet lizards with incorrect substrate that blocks their digestive system.

If you have ruled out health and husbandry issues then you have a picky eater.

You may need to vary the diet you feed by changing their vegetables and insects.

Typically underweight Bearded Dragons are juveniles who have not hit their growth spurt or are adults with anorexia.


Now you know how big an adult bearded dragon will get. A healthy and well-nourished adult Bearded Dragon will be 16 to 24 inches in length and 380 to 510 grams in weight.

Hatchlings are born three inches long. They will grow two inches per month for their first three months.

Make sure you reference the growth chart in this article as your lizard grows.

If you notice any sizes outside of the normal ranges, then immediately review their lighting, diet, and tank-size. As long as they are within the stated size range, then you have a healthy reptile.

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A healthy diet, correct environment and consistent husbandry will help your dragon reach their full grown size.