Sheep Gestation Calculator

How to use the sheep 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 147-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 lambing area.

How long is a sheep's gestation period?

The average is 147 days from breeding to lambing, about 4 months and 3 weeks. Anything between 144 and 152 days is normal, and a typical litter is 1-2 lambs. Treat the calculated date as the middle of that window rather than a fixed appointment.

Sheep gestation table: breeding date to lambing date

Breeding dates one week apart with the matching lambing date at 147 days.

Working backwards from a target lambing date

If you want lambs on the ground in a particular week, switch the calculator to target date mode and enter the date you are aiming for. It subtracts 147 days to give the breeding date to book, plus the earliest and latest service dates that still land inside your window.