Pregnancy Week Calculator

Enter the first day of your last menstrual period (LMP) to instantly see your current pregnancy week and estimated delivery date.

Pregnancy Week Calculator

Enter the first day of your last menstrual period to calculate your pregnancy week and estimated delivery date.

First day of last menstrual period

Select a date to see your pregnancy week.

This calculator provides an estimate based on Naegele's Rule (280 days from LMP). Every pregnancy is unique — please consult your doctor.

How Is It Calculated?

We use Naegele's Rule: the estimated delivery date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. This is the standard method used by obstetricians worldwide.

Important Note

This calculator gives a general estimate. Every pregnancy is different — ultrasound measurements in the first trimester give the most accurate dating. Please consult Dr. Semra Çapar for a personalized assessment.