Animal Gestation Calculator

African elephant Gestation Calculator

A african elephant's gestation period is about 645 days, or roughly 21 months, though it ranges from 640 to 660 days depending on breed and individual animal.

How to use the african elephant gestation calculator

  1. 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. 2. Refine the inputs. The calculator uses the 645-day average for this species.
  3. 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.

Calculate a calf due date

What do you know?

Estimated calving date

Sunday, 18 June 2028

Earliest

13 Jun 2028

Latest

3 Jul 2028

645 days remaining0% complete

0 of 645 days elapsed

Milestone timeline

Key African elephant pregnancy milestones with calculated calendar dates
DayMilestoneDate
60Pregnancy detectable from faecal or urinary hormone monitoring11 Nov 2026
240Ultrasound in managed care tracks calf growth and viability10 May 2027
480Progesterone levels remain high; calf grows rapidly5 Jan 2028
630Progesterone drops sharply — birth is normally within 2 to 5 days3 Jun 2028
645Expected calving18 Jun 2028

What to do next

How long is a african elephant's gestation period?

The average is 645 days from breeding to calving, about 21 months. Anything between 640 and 660 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.

African elephant gestation table: breeding date to calving date

Breeding dates one week apart with the matching calving date at 645 days.

Twelve sample African elephant breeding dates and their calculated due dates
Breeding dateExpected calving date
12 Sept 202618 Jun 2028
19 Sept 202625 Jun 2028
26 Sept 20262 Jul 2028
3 Oct 20269 Jul 2028
10 Oct 202616 Jul 2028
17 Oct 202623 Jul 2028
24 Oct 202630 Jul 2028
31 Oct 20266 Aug 2028
7 Nov 202613 Aug 2028
14 Nov 202620 Aug 2028
21 Nov 202627 Aug 2028
28 Nov 20263 Sept 2028

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 645 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.

African elephant gestation calculator FAQs

How long is an African elephant pregnant?

About 645 days, or close to 22 months, with a normal range of roughly 640 to 660 days. It is the longest gestation of any land mammal.

Why is elephant gestation so long?

Because the calf must be born large and neurologically advanced. A 100 kg newborn that can stand within an hour and follow a moving herd the same day needs almost two years of development, and the brain continues that pattern of slow, social learning after birth.

How is an elephant pregnancy confirmed?

By measuring hormones in faeces or urine, and by ultrasound in zoos and sanctuaries where the cow is trained to cooperate. There is no external sign early on in an animal of that size.

How often does an African elephant give birth?

Roughly every four to five years. With a 22-month pregnancy and two or more years of nursing, this is one of the slowest reproductive rates of any mammal, which is a major reason poaching losses take decades to recover from.

How can keepers tell birth is close?

The definitive signal is a sharp fall in progesterone two to five days before delivery, measured from regular blood samples. Behaviour supports it — restlessness, going off feed, and attendant females crowding close — but the hormone drop is what birth watches are built around.

Do African and Asian elephants have the same gestation?

They are close but not identical. African elephants average around 645 days and Asian elephants around 630, so an Asian elephant calf typically arrives about two weeks sooner.

More gestation pages

Wild animal gestation chart