Sheep gestation calculator
Type the date she was bred: the lambing date, the likely window and what to do before.
Sheep carry about 147 days — just under 5 months. Most have their lambs between day 144 and day 152 after breeding.
Date bred
The day she was with the ram.
Pick the date she was bred to see her due date.
Example: a ewe bred on October 1 is due about February 25 — most likely between February 22 and March 2.
What to do and when
Day 17
Watch for her next heat
Ewes cycle about every 17 days.
Day 144
Start watching her closely
The earliest normal lambing day.
Day 153
Past her normal window
If she shows no signs of lambing, call your vet.
A common guide — your vet’s plan wins.
Questions
How long are sheep pregnant?
Sheep carry about 147 days — just under 5 months. Most have their lambs between day 144 and day 152 after breeding.
How do I work out a sheep’s due date?
Add 147 days to the day she was bred. Example: a ewe bred on October 1 is due about February 25 — most likely between February 22 and March 2.
Why a window and not one day?
No two sheep are the same. Most give birth between day 144 and day 152, so start watching her at the beginning of the window. Meat breeds tend to carry a few days less than fine-wool breeds.
What if she was with the ram for weeks?
Enter the first and the last day they were together. The window then runs from the first day plus 144 days to the last day plus 152 days.
How do I know if she took?
Watch for her next heat about 17 days after breeding. If she does not come back into heat, she has probably settled — your vet can confirm it.
Sources
Last checked September 30, 2026. A common guide — your vet’s plan wins.
More calculators
Remembers every animal’s due date and reminds you before each job — the pregnancy check, the pen, the watch. Coming to the App Store this winter.