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.

Like every tool on Buncha, this one runs entirely in your browser. There's no upload, no log, no record of what you've pasted or generated. Close the tab and the data is gone.

↳ Have feedback or found a bug? hello@buncha.tools