Pregnancy Week & Due Date
Enter your last period date and instantly see how many weeks + days you are, your due date, the trimester, and a Korean prenatal-care schedule. Maternity leave dates included.
How to Use
Choose "Last menstrual period (LMP)" or "Conception date" and enter it. LMP is the standard hospital reference (LMP + 280 days = due date).
Current weeks + days appears in big text along with the due date. Trimester (1st / 2nd / 3rd) and a progress bar follow.
A list of prenatal-care visits (NT scan, anomaly scan, GTT, GBS, etc.) shows their calendar dates. Korean maternity-leave dates (45 days before + 45 days after = 90 total) are auto-calculated.
FAQ
Should I enter LMP or conception date?
LMP is more common (hospital charts use it). Conception is more precise if you know it, but it's usually estimated as LMP + 14 days. The tool supports both.
How is the due date calculated?
International standard (Naegele's rule): LMP + 280 days (40 weeks). Real births commonly fall within ±2 weeks of this date.
What does "14 weeks + 3 days" mean?
It means 14 full weeks plus 3 days have passed since LMP (the standard "completed weeks" notation used in OB-GYN charts).
How does the 90-day maternity leave work?
Under Korean labor law, parents get 90 days total (120 for multiples), with at least 45 days mandatory after birth. This tool computes "due date − 45 days" to "due date + 45 days" by default; adjust to 60/60 for multiples.
Is anything sent to a server?
No. Calculations stay in your browser; the date you enter is saved to localStorage and never leaves the page.
