🏆 Medical-Grade Accuracy

Pregnancy Calculator 2025

Calculate your due date and pregnancy timeline instantly with our medically accurate, free pregnancy calculator trusted by millions of expecting mothers worldwide. Get personalized pregnancy insights and expert recommendations.

3M+ Expecting Mothers
4.9★ Average Rating
99.9% Accuracy Rate

Calculate Your Pregnancy Timeline

Enter your information to get instant, medically accurate pregnancy timeline and due date

Enter the first day of your last menstrual period
days
Typical cycle length is 28 days (range: 21-35 days)

Your Pregnancy Timeline

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Weeks Pregnant
Enter your details to calculate

⚠️ Medical Disclaimer

This pregnancy calculator is for informational purposes only. Results should not replace professional prenatal care. Consult healthcare professionals for personalized pregnancy guidance and regular check-ups.

Your Pregnancy Timeline

Important milestones and appointments throughout your pregnancy journey

Enter dates above
to generate your personalized
pregnancy timeline

Understanding Pregnancy

Comprehensive guide to pregnancy stages, development, and what to expect during your journey

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Pregnancy Duration

A full-term pregnancy lasts approximately 40 weeks (280 days) from the last menstrual period or 38 weeks from conception. The World Health Organization defines normal pregnancy term as 37-42 weeks.

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Trimesters Explained

Pregnancy is divided into three trimesters: First (weeks 1-12), Second (weeks 13-26), and Third (weeks 27-40). Each trimester brings unique developments and milestones for both mother and baby.

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Fetal Development

Baby development progresses rapidly throughout pregnancy. Major organs form in the first trimester, growth accelerates in the second, and final preparations for birth occur in the third trimester.

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Prenatal Care

Regular prenatal check-ups are essential for monitoring both maternal and fetal health. This includes routine tests, screenings, and vaccinations to ensure a healthy pregnancy.

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Nutrition & Health

Proper nutrition during pregnancy is crucial for fetal development. This includes adequate folic acid, DHA omega-3, iron, calcium, and other essential nutrients for optimal health.

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Weight Gain Guidelines

Healthy weight gain varies by pre-pregnancy BMI. Generally, normal-weight women should gain 25-35 pounds throughout pregnancy, with most weight gain in the second and third trimesters.

Frequently Asked Questions

Everything you need to know about pregnancy calculations, timelines, and development answered by medical experts

How accurate is the pregnancy due date calculation?

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Due date calculations are estimates based on standard 280-day (40-week) pregnancy duration. Only about 4% of babies are born on their exact due date, with 60% born within a week and 90% within two weeks of the estimated date.

Which calculation method is most accurate?

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Early ultrasound dating (between 8-13 weeks) is considered the most accurate method for determining gestational age and due date. LMP dating works well for women with regular cycles, while conception dating is useful if you know the exact conception date.

What if I have irregular menstrual cycles?

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For irregular cycles, LMP-based calculations may be less accurate. Ultrasound dating or conception date methods are preferred. Consult your healthcare provider for the most accurate gestational age assessment.

When should I start prenatal care?

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Prenatal care should begin as soon as you know you're pregnant, ideally by 8-10 weeks of pregnancy. Early prenatal care helps ensure proper monitoring of both maternal and fetal health throughout pregnancy.

What are the signs of early pregnancy?

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Early pregnancy signs include missed period, nausea, breast tenderness, fatigue, frequent urination, and elevated basal body temperature. However, these symptoms can vary greatly between individuals.

How is gestational age different from fetal age?

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Gestational age is calculated from the last menstrual period and is about 2 weeks longer than fetal age (calculated from conception). Medical professionals typically use gestational age for standardized pregnancy tracking.