Pregnancy Due Date Calculator Enter the date of the first day of your last menstrual period (LMP): Day: - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Month: - January February March April May June July August September October November December Year: - 2024 2025 DELETE CALCULATE YOUR BABY IS EXPECTED ON: *This is an estimated date of when your baby is due. Most are born within 15 days either side of the estimated due date.