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Enter the breeding date and, if you want days remaining and progress, a reference date (leave it blank to use today). The calculator adds the typical ewe gestation of 147 days to the breeding date, shows the normal 144 to 151 day lambing window, and works out days remaining and progress through gestation. This is a planning estimate only: it does not confirm pregnancy, and a veterinarian should check any animal that passes its window.
A ewe bred on 2026-01-01 has an estimated lambing date 147 days later, with a normal window from 144 to 151 days after breeding. Twin and triplet pregnancies often run slightly shorter than single pregnancies. Use the window for lambing watch, and prepare the lambing pen before it opens. Use this gestation chart and date estimator for your breeding records.
Start close watching a few days before the window opens, and prepare a clean, dry, draught free lambing pen with bedding, water and a lambing kit. Signs of near lambing include udder filling, loosening of the tail ligaments, restlessness and pawing at bedding. Keep the ewe calm, check lambs are breathing and suckling, and call a veterinarian early if labour stalls.
Multiple births are common in sheep, and late pregnancy feeding matters most for ewes carrying twins or triplets. Avoid sudden ration changes in late pregnancy, watch for pregnancy toxaemia in thin or overfat ewes, and record breeding dates, lambing dates and litter sizes for every ewe.
About 147 days on average, with a normal range of about 144 to 151 days. Individual animals vary by breed, litter size and condition.
Add the typical gestation length to the breeding date. For a sheep bred on 2026-01-01, the estimated due date is sheep plus 147 days.
Because healthy births fall across a range, not on one day. Plan your watch period from the window start, and prepare facilities before it opens.
No, it is a planning estimate only. Pregnancy must be confirmed by observation or veterinary examination, and a false pregnancy or wrong breeding date can make the estimate wrong.
About 5 months, or 147 days on average, with a normal range of about 144 to 151 days.
Often slightly, because multiple lambs fill the uterus sooner. The shift is small, usually a few days.
Contact a veterinarian promptly, especially if the animal strains without progress, stops eating, looks weak, or has discharge. Do not decide alone that a pregnancy is overdue.
If animals were exposed over several days, run the calculator from the earliest and latest possible breeding dates and use the wider combined window for planning.
Shelter, yard and fencing for any sheep flock.
Daily feed amounts for sheep by weight and stage.
Daily water for sheep by weight, climate and lactation.
Estimated due date, calving window, days remaining and progress for cow.
Estimated due date, kidding window, days remaining and progress for goat.
Daily, gross and saleable milk plus per ewe totals for a ewe herd.