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Pregnancy Calculator

Calculate pregnancy weeks and due date from the last menstrual period.

Pregnancy Calculator

Estimate your due date, current gestational age, and trimester based on the first day of your last menstrual period (LMP) and your average cycle length.

Last Menstrual Period (LMP)

Average Cycle Length (days)

Most people have a 28-day cycle. Adjust if yours is different.

As-of Date

We’ll calculate gestational age on this date (default is today).

About this calculator

This calculator uses Naegele’s rule to estimate your due date: 280 days from LMP, adjusted for your cycle length. Actual dates may vary. This tool is for informational purposes and is not a substitute for medical advice.