Dolphin Gestation Calculator
Last updated
A dolphin's gestation period is about 365 days, or roughly 11 months and 4 weeks, though it ranges from 340 to 380 days depending on breed and individual animal.
Calculate a calf due date
Estimated calving date
Tuesday, 5 October 2027
Earliest
10 Sept 2027
Latest
20 Oct 2027
0 of 365 days elapsed
Milestone timeline
| Day | Milestone | Date |
|---|---|---|
| 0 | Conception; bottlenose dolphins can breed in any season | 5 Oct 2026 |
| 60 | Ultrasound can confirm pregnancy in managed care | 4 Dec 2026 |
| 300 | Late gestation; the calf's growth peaks | 1 Aug 2027 |
| 365 | Expected calving, about 12 months after conception | 5 Oct 2027 |
How to use the dolphin 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 365-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 calving area.
How long is a dolphin's gestation period?
The average is 365 days from breeding to calving, about 11 months and 4 weeks. Anything between 340 and 380 days is normal, and a typical litter is 1 calf. Treat the calculated date as the middle of that window rather than a fixed appointment.
Dolphin gestation table: breeding date to calving date
Breeding dates one week apart with the matching calving date at 365 days.
| Breeding date | Expected calving date |
|---|---|
| 5 Oct 2026 | 5 Oct 2027 |
| 12 Oct 2026 | 12 Oct 2027 |
| 19 Oct 2026 | 19 Oct 2027 |
| 26 Oct 2026 | 26 Oct 2027 |
| 2 Nov 2026 | 2 Nov 2027 |
| 9 Nov 2026 | 9 Nov 2027 |
| 16 Nov 2026 | 16 Nov 2027 |
| 23 Nov 2026 | 23 Nov 2027 |
| 30 Nov 2026 | 30 Nov 2027 |
| 7 Dec 2026 | 7 Dec 2027 |
| 14 Dec 2026 | 14 Dec 2027 |
| 21 Dec 2026 | 21 Dec 2027 |
Working backwards from a target calving date
If you want calfs on the ground in a particular week, switch the calculator to target date mode and enter the date you are aiming for. It subtracts 365 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.