Horse Gestation Calculator

Many options to fit your needs and budget

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Horse Gestation Calculator

This gestation calculator is for information and fun only. The dates that are calculated are an estimate of when to expect your new arrival and should not be interpreted as an exact foaling date.

This Foaling Date Estimator is based on 340 days gestation. You should average plus or minus 10 days for actual foaling window.

Week 2 (2 weeks to 18 days)

First ultrasound or palpation to detect pregnancy
Select Breed Date
Week 4 – 1st Month

Second ultrasound or palpation to detect heart beat
Select Breed Date
Week 12 – 3rd Month

Give all vaccinations recommended for your area
Worm the mare
Select Breed Date
FOURTH MONTH
Select Breed Date
Week 20 – 5th Month

First Equine Rhinopneumonitis Vaccination
Select Breed Date
SIXTH MONTH
Select Breed Date
Week 28 – 7th Month

Second Equine Rhinopneumonitis Vaccination
Select Breed Date
EIGHT MONTH
Select Breed Date
Week 36 – 9th Month

Third Equine Rhinopneumonitis Vaccination
Select Breed Date
TENTH MONTH
Select Breed Date
Week 44 – 11th Month

Give all vaccinations recommended for your area so that mare produces antibodies in colostrum.

Worm the mare

Begin watching for waxing and other signs of early foaling.
Select Breed Date
DUE DATE
Select Breed Date

Disclaimer: It is the mare owner’s responsibility to consult their vet with regard to broodmare health care. This calendar is only a guideline.

Week 2 (2 weeks to 18 days)

First ultrasound or palpation to detect pregnancy

Select Breed Date
Week 4 – 1st Month

Second ultrasound or palpation to detect heart beat

Select Breed Date
Week 12 – 3rd Month

Give all vaccinations recommended for your area
Worm the mare

Select Breed Date
FOURTH MONTH

Select Breed Date
Week 20 – 5th Month

First Equine Rhinopneumonitis Vaccination

Select Breed Date
SIXTH MONTH

Select Breed Date
Week 28 – 7th Month

Second Equine Rhinopneumonitis Vaccination

Select Breed Date
EIGHTH MONTH

Select Breed Date
Week 36 – 9th Month

Third Equine Rhinopneumonitis Vaccination

Select Breed Date
TENTH MONTH

Select Breed Date
Week 44 – 11th Month

Give all vaccinations recommended for your area so that mare produces antibodies in colostrum.
Worm the mare
Begin watching for waxing and other signs of early foaling.

Select Breed Date
DUE DATE

Select Breed Date

Disclaimer: It is the mare owner’s responsibility to consult their vet with regard to broodmare health care. This calendar is only a guideline.

Days In Foal

There is no guarantee or representations as to the accuracy of the calculation.

Number of days in foal:

Contact Us

Please allow us 48 business hours for response. If urgent, please call us at (559) 942-1101