Mouse vs hamster vs rat: size comparison
A mouse is the smallest of these three rodents, while a rat is the largest. You can visualize the difference in size by comparing their lengths and weights side by side.
Biggest vs smallest
2.88× the size
rat vs mouse
- mouse
- about 3.15 in (8 cm) long and 1.38 in (3.5 cm) tall · 0.882 oz (25 g)
- hamster
- about 5.91 in (15 cm) long and 1.97 in (5 cm) tall · 4.59 oz (130 g)
- rat
- about 9.06 in (23 cm) long and 2.76 in (7 cm) tall · 12.3 oz (350 g)
Typical adult or standard sizes; real ones vary.
Questions people ask
- How much does a mouse weigh compared to a rat?
- A mouse weighs 0.882 oz (25 g), while a rat weighs 12.3 oz (350 g).
- What are the dimensions of a hamster?
- A hamster is about 5.91 in (15 cm) long and 1.97 in (5 cm) tall.
- Which rodent is the longest?
- The rat is the longest at about 9.06 in (23 cm), followed by the hamster at about 5.91 in (15 cm) and the mouse at about 3.15 in (8 cm).