The size of a hamster largely depends on its breed. Adult hamsters typically range in length from 1.6 inches (4 cm) to 7.9 inches (20 cm) and weigh between 0.5 ounces (15 g) and 7 ounces (200 g). Here’s a detailed breakdown:
I. Size Categories
Large Breeds
Syrian Hamsters (Golden Hamsters): Measure 5.9–7.9 inches (15–20 cm) in length and weigh 3.5–7 ounces (100–200 g). Females are usually larger than males.
Large captive-bred individuals: Some can grow over 7.9 inches (20 cm) long and weigh more than 4.2 ounces (120 g).
Medium Breeds
Djungarian Hamsters (Winter Whites): Reach 3.1–4.7 inches (8–12 cm) and weigh 1.1–1.8 ounces (30–50 g).
Campbell’s Dwarf Hamsters: Measure 3.9–4.7 inches (10–12 cm) and weigh 1.1–2.1 ounces (30–60 g).
Small Breeds
Roborovski Hamsters: The tiniest, at just 1.6–2 inches (4–5 cm) long and 0.5–1.1 ounces (15–30 g).
Pudding Hamsters: A variant of Djungarian hamsters, measuring 2.8–4.3 inches (7–11 cm) in length.
II. Growth Stage Characteristics
Juvenile stage (1–3 months): Reach about half their adult size; at 1 month old, they’re roughly 1.6–2.4 inches (4–6 cm).
Sexual maturity (3–6 months): Their size stabilizes. Separate them into individual cages to prevent breeding.
Senior stage (after 1.5 years): May experience slight shrinkage. Adjust care routines accordingly.
III. Factors Affecting Size
Breed differences: Golden hamsters are 3–4 times larger than dwarf breeds.
Living conditions: Adequate space for exercise and a balanced diet support healthy growth.
Sex differences: Female Syrian hamsters are generally larger than males.
Note: When measuring length, check if the tail is included—some size variations stem from different measurement methods.