Mare Gestation Calculator
Calculate the expected foaling date for a mare based on breeding date. Uses an average gestation period of 340 days.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to use the Mare Gestation Calculator
- Select the breeding date – Click the Breeding Date field and choose the date your mare was bred.
- Adjust the gestation period (optional) – The default is 340 days (average). You can enter a value between 320 and 370 days if needed.
- Click “Calculate” – The expected foaling date will appear, along with the number of days remaining (or days since foaling if past).
- Review the result – The formula used is: Foaling Date = Breeding Date + Gestation Period (days).
Note: All dates are in the format YYYY-MM-DD. The gestation period must be a whole number between 320 and 370 days.
Previous Results
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Frequently Asked Questions
The average gestation period for a mare is approximately 340 days, but it can range from 320 to 370 days.
This calculator provides an estimated foaling date based on the entered breeding date and gestation period. Actual foaling may vary.
Yes, you can adjust the gestation period between 320 and 370 days to account for individual variation.