Breeding calendar
Horse Gestation and Foaling Date Calculator
Check the example values, enter your own and calculate.
Method and assumptions
Breeding date + Chosen central gestation lengthThe central date is an estimate, normally entered as 340 days. The cited Penn State reference describes 330–370 days, not a guaranteed or individually safe window. No examinations, vaccinations or treatment dates are prescribed.
References
Example
- Breeding date
- 2026-09-14
- Chosen central gestation length
- 340 day
- Reference date
- 2026-09-14
Central estimated foaling date 2027-08-20 date
Reference window starts 2027-08-10 date