Foaling Calculator
*Uses an typical 340 day gestation length for a Mare. Mare gestation periods can generally be anywhere from 320-370 days.
Foaling Calculator
The Foaling Calculator is much easier to use than the Horse Gestation Chart. The gestation chart is when you had to count the days til the due date. This calculator is no way to take away from the need for you to seek a vet’s professional advice. Their opinion is valuable about your mare’s gestation period. There are many items a professional vet will notice about proper care for your horse. Horses need to sleep lying down to meet their REM sleep needs. But they can also sleep standing, but just won’t meet their REM sleep needs.
Important Guidelines in Using Our Foaling Calculator
GestationCalculator.com is providing this mobile friendly Foaling Calculator as a service. This service is for mare owners to help visitors answer the following questions.
- When should I expect a foal to be born?
- How many days are in a horse gestation period?
It’s important that you enter the first day your Horse was bred. Some horse breeders will find this tool very helpful. So remember to bookmark it. Also, try using any of our other gestation calculators just for fun! Please direct any questions you may have to askabreeder@gmail.com.

Horse Gestation Periods
The Gestation Period for Horses is approximately 320-370 days from the first date bred. Horses will not always conceive after one breeding and will generally mate multiple times in one cycle. The Foaling Calculator above attempts to generalize the estimation of the due date. This is without any additional factors using a 340 day gestation period for horses.