You may be thinking about getting a hamster but need to know what size they are. So, how big is your typical hamster?
Pet hamsters can be up to 7 inches (177.8 mm) long and 6 ounces (170.1 g) heavy, or as small as 1.8 inches (45.7 mm) long and 0.7 ounces (19.8 g) heavy. Different breeds are larger than others; Syrian hamsters are the largest pets. However, wild hamsters can grow to as large as 13 inches (330.2 mm).
The rest of this article will explain how big the five most common hamster breeds are and explore their other unique characteristics. It will also explain how big each hamster breed’s cage should be based on its size and touch upon the world’s largest hamster breed.
Pet Hamster Breeds’ Sizes
Here’s a helpful chart showcasing the five most commonly purchased pet hamsters’ sizes.
| Pet Hamster Breed | Length | Weight |
| Syrian Hamster | 5 to 7 inches (130 to 180 millimeters) | 5.1 to 6 ounces (145 to 171 grams) |
| Roborovski Hamster | 1.8 to 2 inches (450 to 500 millimeters) | 0.7 to 0.9 ounces (20 to 25 grams) |
| Chinese Hamster | 3.2 to 5 inches (82 to 127 millimeters) | 1.1 to 1.6 ounces (30 to 45 grams) |
| Campbell’s Russian Hamster | 2 to 4 inches (55 to 105 millimeters) | 1.5 to 2 ounces (or 40 to 60 grams) |
| Winter White Hamster | 2.7 to 3.5 inches (70 to 90 millimeters) | 0.7 to 1.6 ounces (19 to 45 grams) |