Pregnancy Due Date Calculator
Estimate due date
Naegele's rule: LMP + 280 days (40 weeks). Other inputs supported: conception or ultrasound date.
- Estimated due date (EDD)
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- Conception date
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- End of 1st trimester
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- End of 2nd trimester
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Standard 40-week gestation from LMP. Day-5 IVF transfers add 261 days to transfer (40w − 19d). Adjust for non-28-day cycles.
About this tool
Pregnancy Due Date Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Women's Health — Pregnancy. Browse more Women's Health — Pregnancy tools.