Pregnancy Calculator - Due Date & Week-by-Week Schedule

The Pregnancy Calculator can estimate a pregnancy schedule based on the provided due date, last period date, ultrasound date, conception date, or IVF transfer date.

▼ Modify the values and click the Calculate button to use

Calculate Based On:

Your Due Date:

Week	Date	Trimester	Important Milestones

Pregnancy is typically dated from the first day of the last menstrual period (LMP) and lasts about 280 days (40 weeks), even though conception usually occurs about two weeks after the LMP.

This calculator works from whichever date you know — your due date, LMP, an ultrasound date with its measured gestational age, your conception date, or an IVF embryo transfer date — and converts it back to an estimated LMP to build a full week-by-week pregnancy schedule.

This tool is for general informational purposes only and does not replace guidance from your doctor or midwife.