Pregnancy Week & Due Date Calculator
Calculate your current pregnancy week and due date based on your last period date
Enter the first day of your last period
You can check the pregnancy week for today or a specific date
Current Pregnancy Week
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Due Date
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Pregnancy Progress
0%1st Trimester
Week 1 ~ 13
2nd Trimester
Week 14 ~ 27
3rd Trimester
Week 28 ~ 40
๐ Detailed Information
๐ก Current Week Guide
๐ฏ Important Milestones
First Prenatal Visit Recommended
Around 8 weeks (based on LMP)
Quickening Expected
Around 18-20 weeks
Gender Can Be Determined
Around 16-20 weeks
Detailed Ultrasound
Around 20-24 weeks
What is the Pregnancy Week & Due Date Calculator?
This calculator is a tool that predicts your current pregnancy week and due date based on your last period start date and a specific date (reference date).
Typically, the due date is calculated as 280 days (40 weeks) from the last period start date, and you can check which week of pregnancy you are in through the reference date.
๐ How to Calculate Pregnancy Week
- โข 1 week = 7 days
- โข Pregnancy period = approximately 40 weeks (280 days)
- โข Pregnancy week = (Reference date - Last period date) รท 7 days
- โข Due date = Last period date + 280 days
๐ธ Pregnancy 3 Trimesters
- โข 1st Trimester: Week 1 ~ 13 - Initial implantation and major organ formation
- โข 2nd Trimester: Week 14 ~ 27 - Quickening begins, stable period
- โข 3rd Trimester: Week 28 ~ 40 - Preparing for birth, weight gain
โ ๏ธ Note: This calculator is for reference only. For more accurate pregnancy management and birth planning, please consult with an obstetrician. The actual delivery date may differ by about 2 weeks from the due date, and a more accurate due date can be confirmed through ultrasound examination.