Horse gestation calculator
A mare carries a foal for roughly 340 days, with a normal range of 320 to 362 days. Enter the covering date and this calculator returns the estimated foaling date, the earliest and latest expected dates, the 14-day and 28-day ultrasound windows, the EHV-1 (rhino) vaccination months and the recommended dry-off date.
The calculator itself is interactive and loads with the page. It is free, needs no signup, and nothing you enter is stored.