Pregnancy Due Date Calculator

Estimate your expected due date and current gestational age using your last menstrual period and typical cycle length.

Results

Estimated due date

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Current gestational age

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Trimester

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40-week mark

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38–42 week window

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How this calculator works

This calculator estimates your pregnancy timeline from the first day of your last menstrual period (LMP). It assumes a standard 40-week pregnancy and adjusts for cycle lengths shorter or longer than 28 days. It is not medical advice, always discuss timelines and health questions with your physician or midwife.

Enter the date your last period began and your usual cycle length.
We add 280 days (40 weeks) to your LMP and adjust by the difference between your cycle length and the 28-day average.
Gestational age counts from LMP; due dates are estimates and real timelines vary, so check with your care provider.