Due Date Calculator
NEWCalculate your estimated due date using Naegele's rule. Get weeks pregnant, trimester breakdown, 12 key milestones and next 3 cycles.
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How to use
- 1Enter: YYYY-MM-DD,cycleLength (e.g. 2025-01-15,28)
- 2Cycle length default: 28 days (range: 21–45)
- 3Get due date, weeks pregnant, trimesters, milestones
Frequently Asked Questions — Due Date Calculator
How is the due date calculated?+
Naegele's rule: add 280 days (40 weeks) to the first day of your Last Menstrual Period (LMP). If your cycle isn't 28 days, the calculator adjusts automatically.
What are the pregnancy trimesters?+
1st trimester (weeks 1–13): embryo develops into fetus. 2nd trimester (14–27): most comfortable, anatomy scan at week 20. 3rd trimester (28–40): preparation for birth. Full term: 37+ weeks.