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Pregnancy Due Date Calculator

Estimate your due date and current stage of pregnancy from the first day of your last menstrual period (LMP), using the standard obstetric estimation method.

Leave as 28 if you’re not sure — that’s the typical average.

This is an estimate based on a standard 280-day (40-week) pregnancy length counted from the first day of your last period, adjusted for your reported cycle length. Actual delivery dates commonly vary by up to two weeks in either direction.

If your cycle is irregular, you’re unsure of your last period, or an ultrasound has given a different date, the ultrasound dating is generally more accurate — please discuss this with your doctor.