Pregnancy calculator for Horses

Answers the question: When is the birth date for my pregnant mare?

Pregnancy in horses normally lasts 344 days (between 11 and 12 months), but can be as quick as 333 days and as long as 365 days. This pregnancy calculator for horses will calculate the most likely birth date using the mating date as a starting point.


Most likely birth date: February 23
Earliest birth date: February 12
Latest birth dates: March 16

Remember that these dates are estimates and that an incorrectly entered mating date can significantly affect the estimates.