Size and Growth Chart: How Big Do Hamsters Get?

by Joshua Paulson

how big do hamsters get


There's no doubt that hamsters are cute pets. These furry companions are affectionate, intelligent, and fun. But how big do hamsters get? Not all breeds are the same size. For example, the Syrian hamster can grow to seven inches, while the Dwarf White Russian hamster averages about three inches. Other hamster breeds, like the Roborovski hamster, are even smaller. While this size difference might seem unimportant, it plays a vital role in cage choice, diet, and general hamster care.

Here, we'll review how big hamsters get and look at how breed sizes and lifestyle factors play a role.

Factors Affecting Hamster Size and Growth

When looking at hamster size, the first consideration is always genetics. Some breeds have the potential to grow larger than others. However, lifestyle and diet can also affect individual hamsters within the same breed. Let's take a closer look at some of these determining factors.


As mentioned above, genetic makeup is the first thing to consider when looking at different hamster breeds. For the most part, they range anywhere from two to even seven inches. Here are some examples:

  • Syrian Hamster – 5 to 7 inches at 5 to 7 ounces
  • Chinese Hamster – 3 to 5 inches at 0.7 to 1 ounce
  • Dwarf Winter White Russian Hamster – 3 inches at 0.7 ounces
  • Dwarf Campbells Russian Hamster – 3 inches at 1 to 1.5 ounce

    Of course, these numbers differ depending on other factors, and some might even be outliers. For example, even if Syrian hamsters (AKA golden hamsters) are a larger size breed, they might reach less than 7 inches.

    Still, if your hamster is bigger or smaller than the abovementioned weights, it may be consuming too much or too little food. Some other less common hamsters include the Tibetan hamster, Armenian hamster, Turkish hamster, Azerbaijani hamster, and other dwarf hamster breeds.

    Hamster on a green pail on a child's lap


    The second size difference consideration is gender. The male is usually slightly larger and heavier than the female. For example, male Syrian hamsters will often reach 7 inches and 7 ounces, while females will be on the smaller side of this range at 5 inches and 5 ounces.

    Litter Size

    The number of hamsters in a litter can also influence hamster size. However, this differs across breeds. For example, some Syrian hamsters tend to have litters of six to twelve pups, while others have had up to 20.

    Dwarf hamsters, on the other hand, have smaller litters of four to eight pups on average. So how does litter size influence how big hamsters get?

    If a female has more pups than the average, they'll have to compete for resources like food and nursing. This can lead to some pups being left out and less for each pup, depending on access to food. The result might be stunted growth or a smaller size overall.

    Diet and Nutrition

    When getting a pet hamster, its size is largely out of your control due to specific genetics. However, you can ensure they get all the nutrients they need through their diet. Doing so will make your hamster happy and healthy and support optimal growth. Feed them too much, and they might grow overweight. If they lack nutrients, however, it can easily stunt growth.

    The key is a balanced diet. They benefit from variety, so you should feed them store-bought hamster food, fruits, vegetables, seeds, and a protein source. This ensures they have all the macronutrients they need alongside vitamins. Avoid toxic foods like citrus, chocolate, sugary, salty, or spicy snacks. Also, make sure they always have access to clean water.

    Hamster standing up


    While the hamster breed can provide some general guidelines for expected sizes, individual genetics can also play a vital role in the size of a hamster. Two male Syrian hamsters might vary in weight even with the same diet. Typically, this is due to differences in bone size and muscle mass.

    We can also observe the different growth and evolvement patterns across breeds. For example, Syrian hamsters gradually develop before reaching their final size. In contrast, the Roborovski hamsters enter their mature size earlier.


    Next to diet, a hamster's environment plays a crucial role in determining its size. Healthy exercise in a large cage with the correct levels and toys will facilitate better growth for your hamster. Ensure they have enough water and a nice place to sleep.

    Other considerations may include temperature. For well-being, health, and growth, hamsters should not be exposed to extreme temperatures. Regular room temperature should be adequate. Otherwise, they may become stressed, which can negatively impact growth patterns.

    Hamster on a child's hand

    The Different Breeds of Hamsters and Their Sizes

    If you're set on getting a pet hamster, you'll want to consider the specific sizes of different breeds and how they look. While some might prefer a larger option, others will be comfortable with smaller breeds. However, there are some general sizes to expect for a full-grown hamster.

    Syrian Hamsters

    The first thing you'll notice about Syrian hamsters is that they're much larger than other breeds. Males can reach 7 ounces while being 7 inches long. Females tend to be a bit smaller at 5 ounces and 5 inches.

    Nicknamed "the Golden hamster," Syrian hamsters are a pet favorite and have various coat colors.

    Dwarf Campbell, Russian Hamsters

    Small and affectionate, the Dwarf Campbell Russian hamster reaches a size of 3 inches. They're highly social, and their coats range in colors from lighter to darker hues. Females are slightly smaller than males. In terms of weight, they're usually 0.7 ounces to 1 ounce.

    Small hamster with white background

    Dwarf Winter White Russian Hamsters

    A charming appearance, gentle nature, and overall small size are what characterize Dwarf Winter White Russian hamsters. They're mostly adapted to cold climates and come from Siberia, Mongolia, and Kazakhstan. Typically, males are 3 to 4 inches long and weigh between 20 and 27 grams. Females are slightly bigger and heavier and can reach 4.3 inches and 30 grams.

    Roborovski Hamsters

    This is the smallest hamster breed. They're characterized by their miniature, stocky build and large eyes. Males and females are approximately the same size, weighing about 0.5 inches and reaching a length of 2 inches. They're generally energetic and entertaining to watch. However, their small size may make them hard to handle.

    Chinese Hamsters

    Chinese hamsters are one of the only breeds with a noticeable tail. They generally range in medium sizes, with males about 5 inches long and 1.5 ounces in weight. Females are slightly smaller at 3 inches long and 1 ounce. Typically, Chinese hamsters are kept less as pets, but can still make agreeable and fun pets when cared for properly.

    Hamster on human hand

    Hamster Growth Chart

    To answer the question, of how big hamsters get, it might be useful to follow a growth chart.

    Breed 2 weeks oz/grams 8 weeks oz/grams Adult oz/grams
    Syrian Hamster 0.5/15 1.5-2 / 45-60 6-7 / 170-200
    Dwarf Campbell Russian 0.5/15 1-1.5 / 30-45 3.0-3.5 / 85-100
    Dwarf Winter White Russian 0.5/15 1-1.5 / 30-45 3.0-3.5 / 85-100
    Roborovski Hamster 0.5/15 0.5-0.7 / 15-20 0.5 / 15
    Chinese Hamster 0.5/15 0.8-1 / 25-30 1.0-1.5 / 30-45

    Notice how different hamsters have different rates of growth depending on their overall size. For example, many Roborovski hamsters reach full size at just eight weeks while other hamsters just keep growing.

    How to Determine if Your Hamster Is Growing Properly

    When you get a pet hamster, you'll want to monitor its progress. This ensures that they're healthy and developing correctly. Typically, you should look for energetic behavior, consistent weight gain, and normal eating and drinking. If you notice excessive lethargy, stunted growth, and loss of appetite, it may be time to take your hamster to a vet.

    It's also beneficial to measure the length and size of your hamster every month or so with a scale and a ruler. Mark the sizes and lengths down as your hamster gets older so you can ensure that they reach the right size.

    The Impact of Size on Hamster Care

    hamster on paper cup

    The size of a hamster can also influence the environment it needs for proper growth. For example, Syrian hamsters are larger, so they eat more and need a larger cage and a larger wheel for exercise. On the other hand, dwarf hamsters will make do with a slightly less spacious habitat, and their toys should be smaller too.

    Learn More About Hamster Care With Quality Cage

    So how big can a hamster get? The measurements can differ according to breed, genetics, environment, and diet. Syrian hamsters are the largest species, reaching 7 inches in length, while the Roborovski hamster only reaches 2 inches. Other breeds like the Chinese hamster are more of a medium size.

    If you want the best hamster supplies, then go to You can find the ideal cage, food, water bottles, nesting material, and toys for your hamster without issue. With the right supplies from Quality Cage, you can ensure your furry friend is happy, healthy, and grows to its ideal size.

    You can also choose from exotic pet supplies to care for less traditional pet options.



    How big will my Syrian hamster get?

    Male Syrian Hamsters tend to reach sizes of 7 inches and 7 ounces, while females are around 5 inches and 5 ounces.

    Do dwarf hamsters get bigger?

    Dwarf hamsters usually reach 2 to 3 inches, depending on the specific breed. This is as big as they get due to their specific genetics.

    Do hamsters like to be held?

    This depends on the species of hamster. Some like to be held, while others, like the Syrian Hamster, are known to love solitude.

    Do hamster bites hurt?

    Generally, hamsters won't bite unless they're scared. While bites don't do much damage, they can still hurt.


    Have Questions About Hamster Sizes and Care?

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    Author: Joshua Paulson and Quality Cage Team
    Josh is the owner and CEO at Quality Cage Crafters since 2015. During his time at Quality Cage Crafters he has been able to learn from tens of thousands of pet owners and pet educators. He blends his ambition for manufacturing and passion for animal care to create solutions for pet owners, breeders, animal rescues, and zoos. He has brought together a team of great animal lovers to create high quality pet care content for the Quality Cage Crafters audience.

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