免费预产期计算器
根据末次月经日期计算预产期和当前孕周。
weeks
days
Weeks Remaining
28 weeks
Days Remaining196 days
Current Trimester1
Pregnancy Progress30.0 %
Weeks Remaining vs Weeks Pregnant
公式
## Pregnancy Duration A typical pregnancy lasts **40 weeks (280 days)** from the first day of the last menstrual period (LMP). ### Trimesters | Trimester | Weeks | |---|---| | First | 1-12 | | Second | 13-26 | | Third | 27-40 |
计算示例
A woman who is 12 weeks and 0 days pregnant.
- 01Total days pregnant = 12 x 7 + 0 = 84 days
- 02Days remaining = 280 - 84 = 196 days
- 03Weeks remaining = floor(196 / 7) = 28 weeks
- 04Progress = 84 / 280 x 100 = 30.0%
常见问题
How is a due date calculated?
A due date is estimated as 280 days (40 weeks) from the first day of your last menstrual period (LMP). Only about 5% of babies arrive on their exact due date.
What are the trimesters?
The first trimester is weeks 1-12, the second trimester is weeks 13-26, and the third trimester is weeks 27-40.
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