๐คฐ Pregnancy Week Calculator
Calculate current pregnancy weeks and due date from last menstrual period.
Pregnancy Week Calculation
Based on the last menstrual period (LMP), add 280 days (40 weeks) to get the due date.
Due Date = Last Period Start Date + 280 days
Naegele's Rule
Subtract 3 from the month and add 7 to the day of the start date.
Due Date = (Month - 3), (Day + 7)
Pregnancy Period Classification
| Period | Weeks |
|---|---|
| Early (Weeks 1-12) | 1 ~ 12 weeks |
| Mid (Weeks 13-27) | 13 ~ 27 weeks |
| Late (Weeks 28-40) | 28 ~ 40 weeks |