Mare Gestation Calculator – Accurately calculate your mare’s due date

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Last Updated on January 12, 2023

Discover the exact date your mare will give birth with our revolutionary gestation calculator!

Find out the exact due date of your pregnant mare with our Mare Gestation Calculator! With an average gestation length of 320-362 days, our calculator will give you a reliable estimate of when to expect your mare to foal.



Horses, or mares, are pregnant for an average of 11 months, or 340 days. However, it’s important to note that the length of pregnancy can vary slightly depending on the individual mare and her specific circumstances. Some mares may experience foaling earlier or later than expected. The range of typical pregnancy length for a mare can vary between 320-362 days, and most mares will foal within the window of 330-345 days.

It is always best to consult with a veterinarian experienced with horse reproduction when trying to determine an expected due date. The veterinarian may use ultrasound or palpation to confirm pregnancy and to estimate the due date. Keep in mind that due dates are only an estimate and foaling can occur at any time, mares should be monitored closely, especially in the last few weeks of gestation.

It is important to remember that the pregnancy length is not exact, and that mares have successfully foaled with gestation lengths outside the typical range. Factors such as the mare’s age, breed, and overall health can all play a role in determining the length of pregnancy. Additionally, it’s important to note that during pregnancy mare require special care and attention, in order to have healthy pregnancy and foaling. Therefore, it is important for the mare to be under veterinary supervision throughout the pregnancy to ensure the health and well-being of both the mare and her foal.

During the pregnancy, a mare’s diet should be adjusted to meet the increased energy and nutrient needs of the developing foal. The mare should be kept in good body condition and should not be allowed to become overweight or underweight. Exercise should be limited during the last trimester of pregnancy to prevent the mare from becoming too fatigued or stressed. Additionally, it is important to provide appropriate parasite control and vaccinations to the mare to prevent the transmission of diseases to the foal.

Regular prenatal check-ups are essential in ensuring the health and well-being of the mare and foal. The veterinarian may use ultrasound or palpation to monitor the growth of the foal, check the position of the placenta, and detect any potential problems such as twin pregnancies or placentitis. In the final stages of pregnancy, a mare’s temperature, respiration, and heart rate should be closely monitored to detect any signs of impending foaling. With proper care and supervision, the mare will be able to have a safe and successful foaling experience.

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