Due Date Calculator Pregnancy Estimate
Calculate your estimated pregnancy due date from your last menstrual period or conception date.
View estimated gestational age, pregnancy progress, trimester information, important milestones and common ultrasound timing windows.
Due Date Calculator
Estimate your pregnancy timeline
Estimated Due Date
This is an estimated date based on the information entered.
Conception
Gestational Age
Pregnancy Progress
Estimated progress toward 40 weeks.
Current Trimester
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Calculation Details
Estimated Ultrasound Milestones
These are estimated pregnancy-stage windows. They are not ultrasound findings and should not replace care from your doctor, midwife or sonographer.
Your estimated ultrasound timeline will appear here.
Dating / First Scan
This stage may be used to estimate pregnancy dating, assess development and check whether there is more than one baby.
Anatomy / 20-Week Scan
A detailed pregnancy screening scan commonly offered around the middle of pregnancy.
Growth Monitoring
Additional scans may be recommended when clinically appropriate. Timing varies according to individual care.
Later Pregnancy Scan
Further growth or wellbeing scans can be recommended depending on the pregnancy and healthcare provider.
Pregnancy Milestones
Estimated dates based on the calculated pregnancy timeline.
Calculation Formula
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Calculation Steps
What Can This Due Date Calculator Show?
Calculate an estimated pregnancy timeline and understand important pregnancy stages from your entered date.
Estimated Due Date
Get an estimated delivery date based on the selected calculation method and cycle length.
Gestational Age
See the estimated pregnancy age and current pregnancy week.
Pregnancy Progress
View estimated progress toward a 40-week pregnancy.
Trimester Information
Identify the estimated current trimester and pregnancy stage.
Ultrasound Timeline
See common ultrasound timing windows alongside your estimated pregnancy week.
Pregnancy Milestones
View estimated trimester-end and full-term milestone dates.
How to Use the Due Date Calculator
Follow these simple steps to calculate your estimated pregnancy timeline.
Select a Method
Choose your last menstrual period or estimated conception date.
Enter Your Date
Enter the relevant date and adjust your cycle length if needed.
View Results
Review your estimated due date, pregnancy progress, milestones and ultrasound timing.
Due Date Calculator FAQ
Common questions about estimated pregnancy dates and ultrasound timing.
How is an estimated due date calculated?
The calculator estimates a pregnancy timeline from the selected date and calculation method. When using the last menstrual period, cycle length can be adjusted.
Can an ultrasound change the estimated due date?
Yes. Ultrasound measurements can sometimes lead a healthcare professional to adjust an estimated due date. This calculator does not perform ultrasound measurements. :contentReference[oaicite:1]{index=1}
When is the dating ultrasound usually performed?
The NHS describes a dating scan around 11–14 weeks, although exact timing and availability vary by healthcare system and individual circumstances. :contentReference[oaicite:2]{index=2}
When is the 20-week ultrasound?
The NHS describes the 20-week screening scan as usually taking place between 18 and 21 weeks. :contentReference[oaicite:3]{index=3}
Does this calculator provide an actual ultrasound result?
No. The ultrasound section only compares your estimated gestational week with common ultrasound timing windows. It cannot measure the baby or diagnose a medical condition.
Important Information
This calculator provides estimates for informational purposes only. It does not provide medical advice, diagnosis, ultrasound findings, fetal measurements or confirmation of a pregnancy. Pregnancy dating and scan schedules can vary. Speak with your doctor, midwife or qualified healthcare professional for advice about your individual pregnancy.
Calculate Your Estimated Due Date
Get an estimated due date, gestational age, pregnancy progress, milestones and ultrasound timing information in seconds.
Calculate Due Date