Pregnancy Due Date Calculator

Our Pregnancy Due Date Calculator estimates your due date by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP) or using the conception date if known, adjusting for a standard pregnancy length.

You’ll need the first day of your last menstrual period (LMP) or your conception date. The LMP method is most common, assuming a 28-day cycle, though you can adjust if your cycle length differs.

No, the due date is an estimate based on a 40-week average. Only about 4-5% of babies are born on their exact due date; most arrive between 37 and 42 weeks.

Yes, but the result may be less accurate if your cycle varies significantly from 28 days. For better precision, use your conception date or consult a healthcare provider with ultrasound data.

Yes, the calculator adjusts for leap years when calculating the 280-day period, ensuring the due date is accurate regardless of whether February has 28 or 29 days.