Quick Answer
Browse gerbil growth charts and weight ranges below. Use our breed-specific charts to track if your pet is on target.
⚖️
2-4 oz
Adult weight
📏
4-5 in
Body length
🐹
Tail
Equals body length
📅
3-4 mo
Full size reached
📏Growth & Size Facts
Compact Build
Gerbils are lean and muscular. A round belly usually means obesity or pregnancy.
Tail Length
A healthy gerbil tail is furred and roughly as long as the body. Tail slip is a risk if handled improperly.
Quick Maturation
Gerbils reach adult size by 3-4 months. Growth slows dramatically after that.
Weight Check
Weigh monthly. Adult Mongolian gerbils should be 60-130g depending on sex.
Frequently Asked Questions
How big do gerbils get?
Mongolian gerbils reach 4-5 inches in body length, plus a tail of similar length. They weigh 60-130g (2-4 oz).
Do male gerbils get bigger than females?
Slightly—males tend to weigh 10-20% more than females, but the size difference is less dramatic than in rats.
More Gerbil Resources
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Start Tracking FreeTrusted sources: AKC Breed Standards · AVMA Pet Care