Pregnancy Due Date Calculator
Due date + week-by-week trimester
Educational tool only. For medical advice, always consult your doctor or midwife.
Estimated due date
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Milestones
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Pregnancy due date calculator
Calculate estimated due date from last period, conception, or IVF transfer.
How to use this tool
- 1
Pick calculation method
LMP (last menstrual period) or conception date.
- 2
Enter date
LMP = Naegele rule (+280 days). Conception = +266 days.
- 3
See timeline
Due date, trimester, current week, milestones.
Frequently Asked Questions
How accurate is a due date?
Only 4% of babies arrive on the exact estimated date. 80% arrive within 10 days. Normal range: 37-42 weeks. Always confirm with your doctor and ultrasound.
Pregnancy 101: weeks vs trimesters
Total pregnancy ≈ 40 weeks. 1st trimester: weeks 1-13. 2nd: weeks 14-27. 3rd: weeks 28-40. Full term: 37+ weeks.
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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.