For the interactive calculator, open the full CalcHealth page.
Open Full CalculatorFrequently Asked Questions
How is conception date calculated from due date?
Subtract 266 days (38 weeks) from the due date to estimate the conception date.
Work backwards from your due date to find your estimated conception date and last menstrual period.
For the interactive calculator, open the full CalcHealth page.
Open Full CalculatorSubtract 266 days (38 weeks) from the due date to estimate the conception date.