Horse Gestation Calculator

• Use this horse gestation calculator to find out when your mare is due quickly and easily!
• Or, you might prefer to use our handy horse gestation table.

To Calculate Horse Gestation:

• Type the date the mare was exposed in mm/dd/yy format.
  Do put in the slashes ( / ) but don't use dashes ( - ).
• Type the number of days of gestation you would like to calculate.
• Click the "Estimate Date Of Birth" button.
• The estimated due date is now shown!

Common Gestation Periods (in days)