Horse Pregnancy Calculator
Track your mare’s gestation period from breeding date to foaling with key milestones and management tips.
Note: Horse pregnancy (gestation) typically lasts between 320-370 days, with an average of 340 days (approximately 11 months). This calculator uses the 340-day average for calculations.
Gestation Timeline
Expected Foaling Date
Based on 340-day gestation period (average)
Today is day
of gestation
0% complete
Gestation Milestones
Nutrition & Feeding
Increase feed gradually during last trimester. Provide high-quality forage, balanced minerals, and 1-1.5% of body weight in grain during late gestation.
Veterinary Care
Regular vet checks, deworming schedule, and vaccinations 4-6 weeks pre-foaling. Ultrasound at 14-16 days and 45 days to confirm pregnancy.
Foaling Preparation
Prepare clean, safe foaling stall 2-3 weeks before due date. Have foaling kit ready: iodine, towels, enema, OB equipment, vet contact.
Signs of Foaling
Udder development 2-6 weeks prior, waxing of teaks 24-48 hours prior, pelvic relaxation, restlessness, and sweating 1-4 hours before.
The Mare’s Countdown: Your Guide to the Horse Pregnancy Calculator
The long wait for a foal is filled with anticipation. A horse pregnancy calculator transforms that wait into a clear plan, helping you navigate the nearly year-long journey with confidence.
Your Digital Breeding Assistant
This simple tool uses your mare’s last breeding date and the average gestation of 340 days (approximately 11 months) to estimate a foaling window. While the range can naturally vary from 320 to 365 days, this calculation gives you a vital central date to circle on your calendar.
Why It’s a Breeder’s Essential Tool
Beyond predicting a birthday, this calculator enables proactive mare management:
· Targeted Nutrition: Schedule critical dietary increases for the final trimester to support the foal’s growth.
· Veterinary Scheduling: Plan essential check-ups, ultrasounds, and pre-foaling vaccines.
· Facility Prep: Time the preparation of a safe, clean foaling stall well in advance.
· Life Planning: Organize your “foal watch” schedule to ensure someone is on call.
For Best Results
Accuracy starts with your records. Use the final breeding date for your calculation. Treat the result as a guidepost, not a deadline. As the date nears, watch for physical signs like udder development and relaxation near the tailhead.
A Tool for Partnership
A horse pregnancy tool calculator is a powerful planning aid, not a replacement for veterinary care. Always partner with your vet for pregnancy confirmation and health monitoring.
By combining this modern tool with experienced observation and professional care, you’re ensuring the best possible start for both mare and foal.
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Disclaimer
This calculator provides estimated information only and is not a substitute for veterinary advice. Results may vary based on breed and health. Always consult a qualified veterinarian for accurate guidance.