This Pregnancy Due Date Calculator helps expecting mothers estimate their baby’s arrival date using the first day of the last menstrual period and average cycle length. It provides a simple pregnancy timeline to help with early planning and preparation. While due dates are estimates, this tool offers a helpful starting point for understanding your pregnancy journey.
Pregnancy Due Date Calculator
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Helpful Pregnancy Essential: Pregnancy Pillow
Many expecting mothers find a pregnancy pillow helpful for better sleep and back support during pregnancy.
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Check Price on AmazonImportant Note
This product is for educational and informational purposes only and does not replace professional medical advice. Always consult your healthcare provider for medical guidance.
This page contains affiliate links. We may earn a small commission at no extra cost to you.
© 2026 Pregnancy Due Date Calculator. This tool provides estimates only.
Use our More Health-Related Calculators
For general pregnancy health guidance, you can also refer to information published by the World Health Organization (WHO).
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Understanding Pregnancy Due Dates
Learn how pregnancy due dates are calculated and what to expect during each trimester.
How Does a Due Date Calculator Work?
Your estimated due date (EDD) is calculated based on:
- Last Menstrual Period (LMP): The first day of your last period.
- Conception Date: If known, this can refine the calculation.
- Ultrasound Dating: Early ultrasounds provide the most accurate due date.
The most common method (Naegele’s Rule) adds 280 days (40 weeks) to the first day of your last period.
Pregnancy Timeline & Key Milestones
First Trimester (Weeks 1-12)
- Major fetal development begins (heart, brain, limbs).
- Early pregnancy symptoms (nausea, fatigue).
- The first prenatal visit typically occurs during this time.
Second Trimester (Weeks 13-26)
- Baby’s movements felt (quickening).
- Gender may be detectable via ultrasound.
- Most comfortable period for many women.
Third Trimester (Weeks 27-40+)
- Rapid growth & final organ development.
- Preparation for labor & delivery.
- More frequent prenatal visits.
Frequently Asked Questions
How accurate is a due date calculator?
Due dates are estimates. Ultrasounds in the first trimester provide the most precise dating, typically within 3-5 days of accuracy.
Can my due date change?
Yes, healthcare providers may adjust your due date if early ultrasound measurements differ significantly from LMP-based calculations, especially if your cycles are irregular.
What if I don’t know my last period date?
An early ultrasound can help determine gestational age. The first-trimester ultrasound (especially between 8-12 weeks) provides the most accurate dating.
Are there other ways to predict my due date?
a. IVF pregnancies: Use embryo transfer dates plus 266 days (or 38 weeks).
b. Irregular cycles: May require ultrasound confirmation.
c. Fundal height measurements: Later in pregnancy, though less accurate.
Tips for a Healthy Pregnancy
Nutrition
Focus on folate-rich foods, iron, calcium, and protein. Stay hydrated and consider prenatal vitamins as recommended by your healthcare provider.
Exercise
Engage in safe activities like walking, swimming, or prenatal yoga. Aim for 30 minutes of moderate exercise most days, with your provider’s approval.
Prenatal Care
Attend all scheduled prenatal visits. Discuss any concerns with your provider and follow recommended screening schedules.
© Pregnancy Information Resource. This content is for informational purposes only and not medical advice.