Time & Date Calculators

Pregnancy Due Date Calculator

Estimate expected due date using last menstrual period (LMP) or conception date.

Method

Date

Cycle Length (days, for LMP)

ErrorEnter a valid date

Pregnancy Due Date Formula

LMP method uses 280 days (40 weeks) from LMP, adjusted by cycle length. Conception method uses 266 days from conception.

LMP Jan 1 with 28-day cycle gives estimated due date around Oct 8.

Is this a medical diagnosis?

Calculate the number of days until a future date or event.

Calculate the number of days, weeks, and months between two dates.

Calculate the number of weeks between two dates.