buncha/time & productivity/duedate

Pregnancy Due Date Calculator

Estimates only. Due dates are calculated estimates. Actual delivery typically occurs within 2 weeks of the due date. Always consult your healthcare provider for medical advice.

Calculation method

First day of last menstrual period

Average cycle length28 days

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

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About Pregnancy Due Date Calculator

Pregnancy due date calculator — Naegele's rule (LMP + 280 days) or ultrasound dating. Shows estimated due date plus how far along you are by week + day.

Naegele's rule (LMP + 9 months + 7 days, or LMP + 280 days) assumes a 28-day cycle with ovulation on day 14. If your cycle is longer or shorter, the LMP-based date is approximate — ultrasound dating before 12 weeks is more accurate.

Only ~5% of babies are born on their exact due date; the normal full-term range is 37-42 weeks. The 'weeks pregnant' shown is gestational age (counted from LMP, not conception), which is the convention every pregnancy app and clinical guideline uses.

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