出産予定日計算ツール
出産予定日を計算し、週ごとに妊娠を追跡
Enter the first day of your last period, not the last day.
Estimated Due Date
Wednesday, September 30, 2026
210 days remaining
この電卓は情報提供のみを目的とした概算を提供します。医学的アドバイスではありません。健康に関する決定を行う前に、医療専門家にご相談ください。
Current Progress
10w 0d
Trimester
1
First Trimester
Estimated Conception Date
Wednesday, January 7, 2026
Approximately 14 days after your last menstrual period began
Pregnancy Milestones
Implantation
Embryo implants in uterus
Heartbeat
Heart begins to beat
Embryo Period Ends
All major organs forming
End of First Trimester
Risk of miscarriage decreases
Gender Visible
May be seen on ultrasound
Halfway Point
Anatomy scan typically done
Viability
Baby could survive outside womb
Third Trimester
Final growth phase begins
Full Term
Baby is considered full term
Due Date
Estimated delivery date
Important Dates
End of 1st Trimester
Mar 25, 2026
End of 2nd Trimester
Jul 1, 2026
Full Term (37 weeks)
Sep 9, 2026
Due Date (40 weeks)
Sep 30, 2026
Medical Disclaimer
This calculator provides estimates only. Due dates are based on Naegele's Rule (40 weeks from LMP) and assume a 28-day cycle. Your healthcare provider may adjust your due date based on ultrasound measurements. Only about 5% of babies arrive on their exact due date—most are born within 2 weeks before or after.
出典と方法論
EDD = LMP + 280 days (40 weeks)Naegele's Rule for estimated due date
How to Use the Due Date Calculator
Our pregnancy due date calculator estimates your baby's arrival date based on the first day of your last menstrual period (LMP). See your current week, trimester, estimated conception date, and countdown to your due date.
How It Works
Pregnancy is typically calculated as 40 weeks (280 days) from the first day of your last menstrual period. This is called Naegele's Rule. Actual conception usually occurs about 2 weeks after LMP during ovulation.
What You'll See
- Due Date: Estimated date of delivery (EDD)
- Current Week: How far along you are (weeks + days)
- Trimester: First (weeks 1-12), Second (13-26), or Third (27-40)
- Conception Date: Estimated date of conception (LMP + 14 days)
- Days Remaining: Countdown to your due date
Understanding Trimesters
- First Trimester (Weeks 1-12): Major organs form, morning sickness common
- Second Trimester (Weeks 13-26): Baby grows rapidly, movement felt
- Third Trimester (Weeks 27-40): Final growth, preparation for birth
Important Notes
- Due dates are estimates—only about 5% of babies arrive on their exact due date
- Most births occur within 2 weeks before or after the due date
- Your healthcare provider may adjust your due date based on ultrasound measurements
- This calculator assumes a typical 28-day cycle with ovulation on day 14
Related Health Calculators
Track your health during pregnancy with our BMI calculator and calorie calculator for nutrition guidance. Use our date calculator to plan appointments and milestones.
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