Calculate Due Date

*Please note that the calculation results may differ from the actual date.

Formula for Calculating the Estimated Due Date

Using the start date of the last menstrual period as the 0 week 0 day of pregnancy, the estimated due date is calculated as 40 weeks (280 days).

• Estimated due date = Calculated from the first day of your last menstrual period + 40 weeks

*This site assumes no responsibility whatsoever for the calculation results or any other information provided. We do not offer individual consultations.