Horse Gestation Calculator
Estimate your mare’s expected foaling date with our simple calculator. Just enter the breeding or conception date and get your foaling estimate instantly.
Frequently Asked Questions
How long is the average horse pregnancy?
The average gestation period for a mare is around 340 days, but it can range from 320 to 360 depending on the breed, season, and individual mare.
How do I calculate my mare’s foaling date?
Add 340 days to the breeding or conception date. This calculator does it automatically and gives you an estimated due date and gestation progress.
What’s the earliest safe foaling date?
Foals born after 320 days are generally viable. Any earlier may lead to complications and should involve close monitoring by a vet.
Why do some mares foal later than 340 days?
Gestation can vary based on breed, foal gender, environment, and season. Colts and winter pregnancies often go longer than average.
How accurate is the estimated foaling date?
The calculator gives an average prediction, but every mare is different. The actual foaling date may vary by 1–3 weeks.
Can I use this for miniature horses?
Yes, though minis sometimes have shorter pregnancies. The tool still gives a reliable baseline using 340 days.
When should I start preparing for foaling?
Many owners start prepping around day 300. Watch for changes in behavior, udder development, and make sure your foaling area is ready.
Does the foaling date depend on the foal's gender?
Yes. Mares carrying colts often have slightly longer pregnancies than those carrying fillies.
Where can I learn more about reproduction and foal care?
Check out the books, study materials, and certifications available at Horse Education Online for deeper learning.