Calculadora de Gestação Equina
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
gestação equina: 340 dias (320–360)
About this calculator
The Equine Gestation Calculator estimates the mare's probable foaling date based on the last breeding or insemination date. It uses an average gestation of 340 days, with a normal range of 320 to 360 days, depending on factors like breed, age, and individual conditions.
The calculation is simple: add 340 days to the breeding date. For example, if breeding occurred on January 1, the expected date is December 7 of the same year. The tool also shows the variation period (320, 360 days), useful for planning veterinary checkups and preparing the foaling environment.
Use this calculator to organize reproductive management, schedule ultrasound exams, and ensure the mare receives proper care in late gestation. Breeders and veterinarians benefit from predicting the birth window and avoiding surprises.
Cautions: equine gestation can vary, so do not make critical decisions based solely on this estimate. Consult a veterinarian for confirmation via palpation or ultrasound. Watch for signs of premature or delayed foaling.
Frequently asked questions
What is the average gestation for a mare?
The average gestation is 340 days, but it can range from 320 to 360 days.
How do I calculate the foaling date?
Add 340 days to the last breeding or insemination date.
Is the calculator accurate for all breeds?
No, gestation length can vary by breed and individual. Consult a veterinarian for greater accuracy.
What should I do if the mare goes beyond 360 days?
Seek veterinary assistance immediately, as it may indicate prolonged gestation or complications.
Can I use the calculator for other species?
No, it is designed specifically for horses. Each species has its own gestation period.