Biology Calculators
Sheep Pregnancy Calculator
Calculate expected lambing date from sheep mating date, using a 147-day average and 142-152 day expected window.
Use this sheep pregnancy calculator to estimate the lambing date from the mating date.
The calculator uses the standard average formula: lambing date = mating date + 147 days.
It also shows an expected week range using 142 to 152 days, which reflects common variation in ewe gestation length.
Wednesday, December 30, 2026
Friday, December 25, 2026 to Monday, January 4, 2027
Uses 147 days as the average gestation period, with an expected range of 142 to 152 days.