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Try an Example
Pick a scenario to see how the calculator works, then adjust the values
Due Date from LMP
Calculate the due date using the first day of the last menstrual period (10 weeks ago).
Key values: LMP method · 28-day cycle · Singleton
First Trimester Check
A pregnancy at approximately 8 weeks from conception date.
Key values: Conception method · 8 weeks ago · First trimester
Ultrasound Dating
Calculate timeline from an ultrasound performed at 12 weeks, 3 days.
Key values: Ultrasound method · 12w 3d at scan · 4 weeks ago
IVF Transfer Timeline
Estimate due date from a day-5 embryo transfer completed 14 days ago.
Key values: IVF method · Day-5 transfer · High confidence dating
This calculator is also known as Pregnancy Due Date Calculator.
Read the complete guideWhy Due Dates Matter in Prenatal Care
Due dates anchor prenatal care timing, including routine checkups, anatomy scans, and third-trimester monitoring. Even if the exact birth date differs, using a consistent dating framework helps providers track growth and development against expected gestational milestones.
Examples
IVF Transfer Example
A day-5 embryo transfer happened on January 20.
The tool estimates conception from transfer timing, then projects due date on the standard gestational timeline.
Key takeaway: Transfer-based dating can help reduce uncertainty in estimated due date calculations.
Use Your Result for Better Planning
After calculating your due date, map out upcoming prenatal milestones and discuss any date adjustments with your provider after imaging.
- Track milestone weeks and symptom patterns
- Confirm dating approach during your next prenatal appointment
Frequently Asked Questions about Pregnancy Due Date Calculator
Can IVF pregnancies use a due date calculator?
Yes. IVF transfer-based dating is often very reliable because embryo age and transfer date are known precisely.
Is gestational age different from fetal age?
Yes. Gestational age is usually counted from LMP, so it is often about two weeks ahead of fetal age.
Specialized Calculators
Choose from 4 specialized versions of this calculator, each optimized for specific use cases and calculation methods.
Method
3 CalculatorsAlternative methods and approaches
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