Gerbil Gestation Calculator

Gerbils are pregnant for approximately 24 to 26 days, averaging 25 days. Mongolian gerbils, the common pet species, are the most studied for this figure. A gerbil nursing a previous litter while pregnant can experience delayed implantation, extending gestation to as long as 40+ days in some cases.

Add 25 days to the breeding date. Use the calculator above for an exact expected due date and the full 24–26 day normal range.

Gerbil litters range from 1 to 12 pups, averaging 4 to 6. First litters tend to be smaller. Gerbils are monogamous and typically pair-bond for life, with both parents helping to raise the pups.

Signs include visible weight gain and a rounder body shape from around the second week, increased nest-building activity, and a generally calmer or more food-focused demeanor. Because gerbils are small, physical signs can be subtle until close to the due date.

Pups are born blind, hairless, and fully dependent. Avoid handling the nest for the first week to reduce stress on the parents — gerbils are generally attentive parents, and the male typically helps care for pups, unlike in many other rodent species. Pups' eyes open around day 16–20, and weaning occurs around 3–4 weeks.

At 24–26 days, gerbil gestation is longer than both hamsters (16 days) and mice (20 days), though litters tend to be smaller than either species on average. This reflects gerbils' somewhat different reproductive strategy, including their unusually monogamous, biparental care pattern.