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How Many Weeks Pregnant Am I?

Calculate how many weeks pregnant you are based on your due date, last menstrual period (LMP), or conception date. Includes trimester progress, baby size comparison, and weekly milestones.

How Many Weeks Pregnant Am I?
Enter the due date given by your doctor or midwife
Don't know your due date? Use our Pregnancy Due Date Calculator to estimate it from your last period.

Embed How Many Weeks Pregnant Am I? Widget

About How Many Weeks Pregnant Am I?

Welcome to our Pregnancy Week Calculator, a comprehensive tool designed to help expecting mothers track their pregnancy journey. Whether you know your due date, last menstrual period (LMP), or conception date, this calculator instantly shows you how many weeks pregnant you are, along with trimester progress, baby size comparisons, and important developmental milestones.

How Pregnancy Weeks Are Calculated

Pregnancy is typically calculated from the first day of your last menstrual period (LMP), not from conception. This is the standard method used by healthcare providers worldwide. A full-term pregnancy is considered 40 weeks (280 days) from the LMP, even though actual conception typically occurs about 2 weeks after the LMP.

Calculation Methods Explained

Understanding the Three Trimesters

Trimester Weeks Key Developments What to Expect
First Weeks 1-12 Organ formation, heartbeat begins, neural tube develops Morning sickness, fatigue, breast tenderness
Second Weeks 13-26 Baby movement felt, gender can be determined, rapid growth Increased energy, baby bump visible, fewer symptoms
Third Weeks 27-40 Lungs mature, brain develops rapidly, weight gain Back pain, frequent urination, nesting instinct

Baby Size Week by Week

One of the most exciting aspects of pregnancy is watching your baby grow! Here are common size comparisons used throughout pregnancy:

Popular Baby Size Comparisons
  • Week 4: Poppy seed (about 1mm)
  • Week 8: Raspberry (about 1.6cm)
  • Week 12: Lime (about 5.4cm)
  • Week 16: Avocado (about 11.6cm)
  • Week 20: Banana (about 16.5cm)
  • Week 24: Corn on the cob (about 30cm)
  • Week 28: Eggplant (about 37.6cm)
  • Week 32: Squash (about 42.4cm)
  • Week 36: Honeydew melon (about 47.4cm)
  • Week 40: Watermelon (about 51.2cm)

Important Pregnancy Milestones

First Trimester Milestones (Weeks 1-12)

Second Trimester Milestones (Weeks 13-26)

Third Trimester Milestones (Weeks 27-40)

Frequently Asked Questions

How do I calculate how many weeks pregnant I am?
Pregnancy is calculated from the first day of your last menstrual period (LMP), not from conception. A typical pregnancy is 40 weeks (280 days) from LMP. To calculate your weeks pregnant: subtract your LMP date from today's date, then divide by 7. Alternatively, if you know your due date, subtract 280 days to find your LMP, then calculate from there.
What are the three trimesters of pregnancy?
Pregnancy is divided into three trimesters: First trimester (weeks 1-12) involves major organ development and highest risk of miscarriage; Second trimester (weeks 13-26) is often called the "honeymoon period" when morning sickness eases and the baby bump appears; Third trimester (weeks 27-40) is when the baby gains weight rapidly and prepares for birth.
Is pregnancy 9 months or 10 months?
While pregnancy is often described as 9 months, it's actually closer to 10 lunar months (40 weeks or 280 days). This is because pregnancy is counted from the first day of your last menstrual period, which is typically about 2 weeks before conception actually occurs.
How accurate is the due date calculation?
Due date calculations are estimates. Only about 5% of babies are born on their exact due date. Most babies are born within 2 weeks before or after the due date. First-trimester ultrasound dating is most accurate for confirming due dates.
What is the difference between gestational age and fetal age?
Gestational age counts from the first day of your last menstrual period (LMP) and is the standard used by doctors (40 weeks total). Fetal age (or embryonic age) counts from the actual date of conception, which is typically about 2 weeks after LMP. So if you're 10 weeks pregnant by gestational age, your baby's fetal age is approximately 8 weeks.
When does each trimester start and end?
First trimester: Week 1 to Week 12 (conception through early development). Second trimester: Week 13 to Week 26 (baby movement becomes noticeable). Third trimester: Week 27 to Week 40 (final growth and preparation for birth).

Tips for a Healthy Pregnancy

When to Contact Your Healthcare Provider

While this calculator helps track your pregnancy, always consult your healthcare provider for medical advice. Contact them immediately if you experience:

Additional Resources

Reference this content, page, or tool as:

"How Many Weeks Pregnant Am I?" at https://MiniWebtool.com/how-many-weeks-pregnant-am-i/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Jan 30, 2026

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