Pregnancy Due Date Calculator

Estimate pregnancy due date from last menstrual period (LMP). Informational only.

Calculator

Estimate due date using first day of last menstrual period (LMP). Informational only.

First day of last period (LMP)

Average cycle length (days)

Estimated due date

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Estimated gestational age

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This is an estimate. Your clinician may adjust based on ultrasound and medical history.

Pregnancy due date calculator

Due date estimates are often calculated from the first day of the last menstrual period (LMP) using a typical 40-week pregnancy length. Cycle length can shift ovulation timing, so results are approximate.

FAQ

Is the due date exact?

No. It’s an estimate. Many births occur before or after the date.

Should I rely on this for medical decisions?

No. Consult your clinician for personalized guidance.