Foaling Calculator

The due date for this calculator is based on a 340-day gestation length. The average gestation length (duration of pregnancy) of mares is 335 to 340 days, but can range from 320 to 370 days. There may be much variability among mares, but most individually follow similar patterns year after year.

Please note: The dates provided are an estimate ONLY. Please consult your veterinarian for their recommendations on vaccinations and pregnancy check guidelines.

Please select the estimated conception date of your mare and hit the "Submit" button.