Due Date Calculator
Due Date Calculator
Calculate due date and important pregnancy information based on LMP
Usage Tips
- Please accurately enter the first day of your last menstrual period
- For women with irregular menstrual cycles, the calculation may have slight errors
- The due date is just an estimate, actual delivery time may be two weeks earlier or later
- If you have any doubts, please consult a professional doctor
Instructions
The Due Date Calculator helps you:
- Calculate your due date based on the first day of your last menstrual period
- View your current pregnancy week and days
- See how many days are left until your due date
- Get important pregnancy milestone dates
Calculation Principle
The due date calculation uses the standard Naegele's Rule:
- Due Date = First day of Last Menstrual Period + 280 days (40 weeks)
- The entire pregnancy is about 280 days, divided into three stages:
- First Trimester: Weeks 1-12
- Second Trimester: Weeks 13-28
- Third Trimester: Weeks 29-40
Important Notes
⚠️ Important Reminder:
- The due date is just an estimate; only about 5% of babies are born on their exact due date.
- Most babies are born within two weeks before or after the due date.
- If you have any health concerns, please consult your doctor promptly.
- This tool is for reference only and cannot replace professional medical advice.
Related Information
- Pregnancy Weeks - Check detailed fetal development
- Weight Tracker - Record pregnancy weight changes
- Fetal Movement Counter - Monitor fetal movement
Gentle Reminder: All information provided by this tool is for reference only. Please follow professional medical advice for specific pregnancy management.