Hamster Gestation Calculator
Last updated
A hamster's gestation period is about 16 days, or roughly 0 months and 2 weeks, though it ranges from 15 to 18 days depending on breed and individual animal.
Calculate a pup due date
Estimated birthing date
Saturday, 14 November 2026
Earliest
13 Nov 2026
Latest
16 Nov 2026
0 of 16 days elapsed
Milestone timeline
| Day | Milestone | Date |
|---|---|---|
| 1 | Separate the male immediately — hamsters do not co-parent | 30 Oct 2026 |
| 10 | Weight gain and a rounder belly become noticeable | 8 Nov 2026 |
| 13 | Full cage clean and extra nesting material — the last disturbance | 11 Nov 2026 |
| 15 | Earliest normal birth; leave the cage completely alone from here | 13 Nov 2026 |
| 16 | Expected birth for a Syrian hamster | 14 Nov 2026 |
| 30 | Pups' eyes open; first solid food | 28 Nov 2026 |
| 38 | Wean and separate by sex before pups can breed | 6 Dec 2026 |
How to use the hamster gestation calculator
- 1. Choose what you know. Enter the breeding date to get a due date, or switch to the target due date mode to work backwards to the breeding date you need.
- 2. Refine the inputs. Pick the breed so the calculator uses the right average gestation length.
- 3. Plan around the range. Use the earliest and latest dates and the milestone timeline to schedule checks, feed changes and preparation of the birthing area.
How long is a hamster's gestation period?
The average is 16 days from breeding to birthing, about 0 months and 2 weeks. Anything between 15 and 18 days is normal, and a typical litter is 6-8 pups. Treat the calculated date as the middle of that window rather than a fixed appointment.
Hamster gestation table: breeding date to birthing date
Breeding dates one week apart with the matching birthing date at 16 days.
| Breeding date | Expected birthing date |
|---|---|
| 29 Oct 2026 | 14 Nov 2026 |
| 5 Nov 2026 | 21 Nov 2026 |
| 12 Nov 2026 | 28 Nov 2026 |
| 19 Nov 2026 | 5 Dec 2026 |
| 26 Nov 2026 | 12 Dec 2026 |
| 3 Dec 2026 | 19 Dec 2026 |
| 10 Dec 2026 | 26 Dec 2026 |
| 17 Dec 2026 | 2 Jan 2027 |
| 24 Dec 2026 | 9 Jan 2027 |
| 31 Dec 2026 | 16 Jan 2027 |
| 7 Jan 2027 | 23 Jan 2027 |
| 14 Jan 2027 | 30 Jan 2027 |
How breed changes the birthing date
Selecting a breed swaps the average the calculator uses, which can move the birthing date by more than a week.
| Breed | Average days | Difference |
|---|---|---|
| Syrian (golden) | 16 | — |
| Chinese | 21 | +5 days |
| Campbell's dwarf | 19 | +3 days |
| Winter white dwarf | 20 | +4 days |
| Roborovski | 23 | +7 days |
Working backwards from a target birthing date
If you want pups on the ground in a particular week, switch the calculator to target date mode and enter the date you are aiming for. It subtracts 16 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.