Horse Gestation Calculator
Chemistry & BiologyEstimate a mare foaling date range from the number of days since mating.
Days Until Average Foaling (day 338)
Days remaining until the average expected foaling date, 338 days after mating.
Days Until Earliest Possible (day 331)
162
Days remaining until the earliest end of the typical foaling range.
Days Until Latest Possible (day 346)
177
Days remaining until the latest end of the typical foaling range.
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Odeh Ahwal0people find this calculator helpful
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Chemistry & Biology calculators
Frequently Asked Questions
How long is a horse pregnancy?
A mare pregnancy averages 338 days, roughly 11 months, with a typical range of 331 to 346 days.
Why is horse gestation measured from mating rather than ovulation?
Ovulation can occur up to about 24 hours after mating, which can delay actual fertilization. Measuring from mating date rather than the exact fertilization moment is the standard, practical convention, already reflected in the 338-day average.
How does horse gestation length compare to other large livestock?
At roughly 338 days, horse gestation is meaningfully longer than cattle (283 days) but shorter than some other large mammals, reflecting differences in typical adult body size and offspring development at birth across species.
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