Mare Gestation Calculator

Created By : Vinay Kumar Prajapati

Reviewed By : Rajashekhar Valipishetty

Last Updated : May 06, 2025

Make use of our online Mare Gestation calculator tool that helps you to calculate the pregnant mares' foaling day easily in a fraction of seconds. For using this calculator, you need to simply give the inputs in the input fields and then click on the calculate button. So that you will get the answers instantly.

Mare Gestation Calculator - Horse Gestation: Curious to know how can we calculate the foaling date with horse pregnancy length? Then look into our calculator tool that helps you to calculate the mare gestation easily. And also we have given you detailed information about mare gestation like examples, formulas, and steps on how to calculate the mare gestation manually.

What is Horse Gestation Period in Days?

The average length of adult female horse pregnancy length is equal to 338 days(approx. 11 months). Large horse pregnancies tend to last longer than tiny ponies. Female horses give birth to only one foal.

What is Foaling?

Foaling is nothing but the adult female horse going into labor. The result of that entire process is called a foal.

Formula to Calculate the Foaling Date

By using the below equations you can easily calculate the foaling date of female horse pregnancy.

Estimated Delivery Date:

Foaling = MatingDate + 338

Full Range of Possible Foaling Days:

Earlier possible foaling = MatingDate + 331

Present possible foaling = MatingDate + 346

You can also easily calculate the pregnancy day of your female horse by using the below equation:

Pregnancy day = Current date - Mating date

How do you Calculate the Foaling Date of Pregnant Horses?

Simply follow the guidelines that are provided below to calculate the foaling date of pregnancy horses easily by hand.

  • Firstly, take the values that were given in the problem.
  • As you know the mating date of the horse.
  • Apply the above formulas.
  • Substitute the mating date and then calculate the equation.
  • Finally, you will get the mare gestation easily.

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FAQs on Mare Gestation Calculator

1. How long is a horse pregnant?

A female horse will be pregnant for 330-345 days. The average horse pregnancy length will be 338 days.

2. How to use this Mare Gestation Calculator?

Simply give the inputs in the inputs fields and then click on the calculate button. So that you will get the answer instantly.

3. What is the formula for calculating how far along my mare is?

The formula to calculate the pregnancy date of the female mare is Pregnancy day = Current date - Mating date.