Pregnancy Due Date Calculator: Estimate Your Baby's Arrival
Calculate your baby's estimated due date based on your last menstrual period (LMP), conception date, or a recent ultrasound.
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Calculate your baby's estimated due date based on your last menstrual period (LMP), conception date, or a recent ultrasound.
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Most common method using the first day of your last period. Adds 280 days (40 weeks) plus cycle length adjustment.
Uses the actual conception date. Adds 266 days (38 weeks) from conception to due date.
Uses first trimester ultrasound scan. Most accurate method when available, especially for irregular cycles.
For assisted reproductive technology. Uses embryo transfer date and embryo age at transfer.
Accurate due date calculation is crucial for proper prenatal care, monitoring fetal development, and planning for delivery. It helps healthcare providers:
The calculated date when your baby is most likely to be born. Only about 5% of babies are born exactly on their due date.
How far along you are in your pregnancy, measured in weeks and days from the start of your last menstrual period.
Key milestones in your pregnancy journey, including trimester boundaries and full-term dates.
Always discuss your due date calculation with your doctor or midwife. They may adjust the date based on:
Looking for more pregnancy-related calculations? Our comprehensive suite of tools can help you throughout your pregnancy journey:
Select from Last Menstrual Period (LMP), conception date, ultrasound date, or IVF transfer date.
Input the date based on your chosen method. LMP is most commonly used and reliable.
Enter your average menstrual cycle length if different from the standard 28 days.
Get your estimated due date using Naegele's Rule (280 days from LMP).
See current week, trimester information, and important pregnancy milestones.
Your calculated due date based on the method selected. Remember this is an estimate - most babies are born within 2 weeks of this date.
How far along you are in your pregnancy. Pregnancy is typically 40 weeks from LMP or 38 weeks from conception.
Which trimester you're in: 1st (weeks 1-12), 2nd (weeks 13-27), or 3rd (weeks 28-40). Each has different characteristics.
Babies born between 37-42 weeks are considered full-term. This is the safest time for delivery.
Choose LMP, conception, ultrasound, or IVF/ART to estimate your due date. We also show current week and simple trimester milestones.
Estimate your due date with clinically recognized methods: Last Menstrual Period (LMP) with cycle adjustment, Conception date, early Ultrasound dating, and IVF/ART transfer day (day 3/day 5). See trimester milestones and understand accuracy ranges. Based on ACOG/IOM guidance.
LMP, Conception, Ultrasound, and IVF/ART with embryo age.
First-trimester ultrasound is most accurate; LMP assumes regular cycles.
Trimester boundaries and full-term range at a glance.
Plan comprehensively with health calculators.
Important: This pregnancy due date calculator is designed for educational and informational purposes using standard obstetric dating methods including Naegele's rule and ultrasound-based estimations. While calculations follow established medical protocols, actual pregnancy duration varies significantly based on individual factors including maternal health, fetal development, previous pregnancy history, and natural biological variation. Due dates are estimates, and normal pregnancies can vary by several weeks. This tool does not replace professional medical care and should not be used for medical decisions, treatment planning, or pregnancy management. For accurate pregnancy dating, prenatal care, delivery planning, and all pregnancy-related medical decisions, always consult with qualified healthcare providers including obstetricians, midwives, or family physicians who can provide personalized medical guidance based on your individual health status and pregnancy progression.
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