Horse Gestation Period Calculator

Are you interested in knowing when your lovely and beautiful pregnant horse would be foaling? This horse gestation calculator is the best online pregnancy calculator that you need to determine the estimated date that your pregnant mare will deliver her foal. To calculate the horse gestation period using this calculator, select the date of first mating and click the calculate button. The foaling date would be displayed instantly.

Horses have an average gestation period of 345 days. The gestation period in horses is normally 320 – 370 days counting from the first day of mating.

You can also use this equine or horse gestation period calculator for these breeds of horse.

Some frequently asked questions on horse heat period, gestation period and gestation chart or table have been answered.

What is the gestation period of horses / how long is a horse pregnant?

Generally, horses are known to have a gestation period or length of 320 – 370 days or an average of 345 days which is close to 12 months. This means a horse will be pregnant for about 11 – 12 months before foaling (an act of giving birth in horses). Use the horse pregnancy calculator at the top of this page to calculate the estimated foaling date for any female horse.

What is the heat or oestrus cycle of a horse?

Horses have an oestrus or heat cycle of 19 – 26 days or an average of 22 days. Each heat or oestrus lasts for about 5 – 7 days or 6 days on an average. This simply means that if a mare (female horse) comes on heat and she isn’t able to mate with a stallion within 5 – 7 days, then she will have to wait for another 19 – 26 days for the oestrus to return.

Horse Gestation Chart, Table or Calendar

With a horse gestation chart or calendar, you would be able to monitor or determine the estimated foaling date of a pregnant mare. Use the gestation chart below. Click on the image to view or download.