🐴 Mare Gestation Calculator – Horse Gestation
Estimate how many days remain until a mare is due to foal, based on days since breeding and her breed type.
What this calculator does
The Mare Gestation Calculator estimates how many days remain until a mare is due to foal, based on days since breeding and her general breed type.
The method it uses
Horse gestation averages around 340 days but ranges widely, roughly 320 to 370 days. Pony breeds tend to run a bit shorter (around 320 days), light riding breeds average near 338 days, and draft breeds often run longer (around 345 days). This calculator subtracts the days already elapsed from the expected total for the selected breed type.
Mare gestation length is naturally quite variable between individuals, so treat this as a general estimate. This tool is for general planning purposes; consult a veterinarian for confirmed pregnancy staging, especially in the final weeks before foaling.