Pregnancy Calculator
Track pregnancy by week based on conception or due date.
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Pregnancy Calculator
Track your pregnancy by week and trimester, with an estimated due date from your last period.
days
Current week of pregnancy
Due date
Estimated conception
Days pregnant
Enter the first day of your last period and press Calculate.
How pregnancy is tracked
Pregnancy is dated from the first day of your last menstrual period (LMP), about two weeks before conception actually happens.
Due date = LMP + 280 days (~40 weeks)
Conceived = LMP + 14 days
Conceived = LMP + 14 days
| Trimester | Weeks |
|---|---|
| First | Week 1 – 13 |
| Second | Week 14 – 26 |
| Third | Week 27 and beyond |
Dates are estimates — only about 5% of babies arrive exactly on their due date.