Pregnancy Calculator

Estimate due date and pregnancy week from last period.

Enter Your LMP Date

First day of your last menstrual period

Last Menstrual Period (LMP)

Estimated Due Date

Pregnancy Milestones

Enter your last menstrual period date to get your due date.

Step-by-step Solution

Naegele's Rule

The standard method for calculating EDD: add 280 days (40 weeks) to the first day of your last period.

Only about 5% of babies are born exactly on the due date; most arrive within 1-2 weeks.

Related Calculators

Ovulation Calculator

Health

Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the pregnancy figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.