Due Date Calculator
Estimate your baby's due date and pregnancy milestones.
Due dates are estimates and do not replace prenatal medical care.
Due date calculator
Choose a calculation method and enter the date details you know.
LMP method assumes ovulation around day 14 of a 28-day cycle.
Cycle length can shift estimated ovulation and due date.
Estimated due date
Tuesday, January 12, 2027
Based on the selected method: Last menstrual period. This is not an exact prediction.
Estimated gestational age
10 weeks, 1 days
Current trimester
First trimester
Days until due date
209 days
Due dates are estimates. Pregnancy care should be guided by qualified healthcare professionals, and ultrasound dating or clinician assessment may revise the date.
Personalized interpretation
Based on last menstrual period, your estimated due date is Tuesday, January 12, 2027.
You may be approximately 10 weeks and 1 days pregnant.
Due dates are estimates. Many pregnancies deliver before or after the calculated date, and your healthcare professional may revise your due date after an ultrasound.
Seek medical care promptly for concerning symptoms such as heavy bleeding, severe pain, fainting, or reduced fetal movement later in pregnancy.
Pregnancy timeline overview
Calculation methods explained
Last menstrual period
Uses the first day of your last menstrual period plus cycle-length adjustment.
Conception date
Uses a known or estimated conception date.
IVF transfer
Uses embryo transfer date and embryo age.
LMP vs conception date vs ultrasound dating
LMP is common because many people know their last period date. Conception date can be harder to know exactly.
Ultrasound dating may be used clinically, especially early in pregnancy. Irregular cycles can make LMP-based estimates less accurate.
Trimester guide
First trimester
Weeks 1–13
Early pregnancy is commonly counted from the first day of the last menstrual period.
Second trimester
Weeks 14–27
Many people have anatomy scans and ongoing prenatal visits during this stage.
Third trimester
Weeks 28–40+
The final trimester includes continued growth, monitoring, and birth preparation.
Week boundaries can vary slightly by source. Prenatal care schedules should come from a clinician.
Why due dates can change
Exact delivery date cannot be predicted by a calculator. A due date is a planning estimate, not a deadline.
Limitations and medical disclaimer
Calculator results are informational only. Dates are estimates, and pregnancy care should be guided by healthcare professionals.
IVF details and complex medical histories should be reviewed clinically.
Seek urgent medical attention for symptoms such as heavy bleeding, severe abdominal pain, fainting, severe headache, chest pain, shortness of breath, or reduced fetal movement later in pregnancy.
Formula / date explanation
LMP method: Estimated Due Date = First Day of Last Menstrual Period + 280 daysConception method: Estimated Due Date = Conception Date + 266 days280 days is about 40 weeks from LMP. 266 days is about 38 weeks from conception. IVF due date depends on transfer date and embryo age. Ultrasound or clinician assessment may override calculator estimates.
Frequently Asked Questions
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