Chimpanzee Gestation Calculator
Last updated
A chimpanzee's gestation period is about 237 days, or roughly 7 months and 3 weeks, though it ranges from 230 to 240 days depending on breed and individual animal.
Calculate a infant due date
Estimated birthing date
Sunday, 30 May 2027
Earliest
23 May 2027
Latest
2 Jun 2027
0 of 237 days elapsed
Milestone timeline
| Day | Milestone | Date |
|---|---|---|
| 0 | Conception during the female's visible swelling | 5 Oct 2026 |
| 30 | The sexual swelling does not return; pregnancy likely | 4 Nov 2026 |
| 150 | Belly and breasts begin to enlarge | 4 Mar 2027 |
| 237 | Expected birth, around eight months after conception | 30 May 2027 |
How to use the chimpanzee 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. The calculator uses the 237-day average for this species.
- 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 chimpanzee's gestation period?
The average is 237 days from breeding to birthing, about 7 months and 3 weeks. Anything between 230 and 240 days is normal, and a typical litter is 1 infant. Treat the calculated date as the middle of that window rather than a fixed appointment.
Chimpanzee gestation table: breeding date to birthing date
Breeding dates one week apart with the matching birthing date at 237 days.
| Breeding date | Expected birthing date |
|---|---|
| 5 Oct 2026 | 30 May 2027 |
| 12 Oct 2026 | 6 Jun 2027 |
| 19 Oct 2026 | 13 Jun 2027 |
| 26 Oct 2026 | 20 Jun 2027 |
| 2 Nov 2026 | 27 Jun 2027 |
| 9 Nov 2026 | 4 Jul 2027 |
| 16 Nov 2026 | 11 Jul 2027 |
| 23 Nov 2026 | 18 Jul 2027 |
| 30 Nov 2026 | 25 Jul 2027 |
| 7 Dec 2026 | 1 Aug 2027 |
| 14 Dec 2026 | 8 Aug 2027 |
| 21 Dec 2026 | 15 Aug 2027 |
Working backwards from a target birthing date
If you want infants on the ground in a particular week, switch the calculator to target date mode and enter the date you are aiming for. It subtracts 237 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.