How to Use the Horse Gestation Calculator
Calculate mare foaling timeline and equine breeding milestones:
Enter Breeding Date
Select date of last breeding or artificial insemination.
Calculate 336 Days
Engine adds 336 days average equine gestation.
Schedule Vet Exams
Schedule initial ultrasound around Day 14-16 to check for twins.
Prepare Foaling Stall
Prepare clean, straw-padded foaling stall in Month 10.
Key Features & Equine Reproduction
336-Day Equine Gestation
Calculates standard 336-day gestation for Thoroughbred, Quarter Horse, and Warmblood mares.
Twin Detection Milestones
Projects critical Day 14-16 ultrasound dates for early twin identification.
100% Private Client Compute
Runs in browser memory with zero tracking or server logs.
Equine Reproduction Guide: Mare Gestation & Foaling Care
Mare pregnancy averages 336 days. Early transrectal ultrasonography at Day 14-16 is essential to confirm pregnancy and check for twins. In late gestation, mares require increased protein and energy supplementation.
Frequently Asked Questions
?How long is a horse pregnant?
Equine gestation averages 336 days (11 months).