The body size of dwarf hamsters varies according to different species, but they are generally small hamsters. Here's a specific description of how big dwarf hamsters can grow:
Roborovski Hamster: It's the smallest among hamsters. Although the specific size isn't clearly stated, since it's described as the smallest among hamsters, it can be inferred that both its body length and weight are relatively small.
Jamaican Hamster: It has a body length of 0.2 meters and a weight ranging from 0.5 to 0.6 kilograms. It's a relatively large species among dwarf hamsters.
African Pygmy Mouse: Its size is between 5 to 7 centimeters (including the body and tail), and its weight ranges from 2.5 to 12.0 grams. It's a very small species of dwarf hamster.
For other dwarf hamster species whose sizes aren't specifically mentioned, you can make a rough estimate by referring to the ranges given above. Generally speaking, dwarf hamsters are generally small in size and are suitable as small pets for home keeping.