🤰 About Pregnancy Calculator

Our pregnancy calculator helps you estimate your due date and track your pregnancy journey. It calculates your expected delivery date based on your last menstrual period (LMP), conception date, or known due date.

The calculator provides week-by-week information, trimester breakdowns, and important pregnancy milestones to help you prepare for your baby's arrival.

📝 How to Use the Pregnancy Calculator

Method 1: Last Menstrual Period (Most Common)

  • Click "Last Menstrual Period (LMP)"
  • Enter the first day of your last period
  • Optionally adjust your cycle length (default is 28 days)
  • Click "Calculate Due Date"

Method 2: Conception Date

  • Click "Conception Date"
  • Enter the estimated conception or ovulation date
  • Click "Calculate Due Date"

Method 3: Known Due Date

  • Click "Known Due Date"
  • Enter the due date provided by your healthcare provider
  • Click "Calculate Due Date" to see your timeline

📊 Understanding Pregnancy Trimesters

🌱 First Trimester (Weeks 1-12)

The first trimester is crucial for your baby's development. During this time:

  • All major organs and body systems begin to form
  • The heart starts beating around week 6
  • Morning sickness, fatigue, and breast tenderness are common
  • Risk of miscarriage is highest during this period
  • First prenatal appointments and tests occur

🌸 Second Trimester (Weeks 13-26)

Often called the "golden period" of pregnancy:

  • Morning sickness usually subsides
  • You'll start feeling baby's movements (quickening)
  • Baby's gender can typically be determined via ultrasound
  • Your energy levels often increase
  • Baby bump becomes more noticeable

🎈 Third Trimester (Weeks 27-40)

The final stretch before meeting your baby:

  • Baby gains most of their weight during this time
  • Braxton Hicks contractions may occur
  • Nesting instinct often kicks in
  • Regular prenatal visits increase in frequency
  • Prepare for labor and delivery

🧮 How Your Due Date is Calculated

Healthcare providers use several methods to calculate due dates:

Naegele's Rule (Most Common):

This is the standard calculation method:

  • Take the first day of your last menstrual period (LMP)
  • Add 280 days (40 weeks or 9 months + 7 days)
  • Adjust for cycle length if different from 28 days

From Conception Date:

  • Add 266 days to the conception date
  • This is approximately 38 weeks from conception

Ultrasound Dating:

  • Most accurate in the first trimester
  • Measures crown-rump length or other fetal measurements
  • Your healthcare provider may adjust your due date based on ultrasound

🎯 Important Pregnancy Milestones

  • Week 6: Heartbeat can be detected via ultrasound
  • Week 8-10: First prenatal ultrasound typically performed
  • Week 12: End of first trimester, reduced miscarriage risk
  • Week 16-20: Anatomy scan to check baby's development
  • Week 18-22: May start feeling baby's movements
  • Week 20: Gender can often be determined
  • Week 28: Third trimester begins, baby viable if born
  • Week 37: Full term, baby can be born safely
  • Week 40: Due date arrives!

✨ Key Features

  • Multiple Calculation Methods: Calculate by LMP, conception date, or known due date
  • Accurate Results: Uses Naegele's Rule for standard calculations
  • Week-by-Week Tracking: See where you are in your pregnancy journey
  • Trimester Breakdown: Detailed information for each trimester
  • Important Dates: Key milestones and appointment reminders
  • Progress Visualization: Visual progress bar showing your journey
  • Baby Development: Weekly updates on baby's size and development
  • 100% Free: No registration or payment required

❓ Frequently Asked Questions

How accurate is the pregnancy calculator?

The calculator provides an estimate based on standard calculations. Only about 5% of babies are born on their exact due date. Most babies arrive within 2 weeks before or after the estimated due date. Your healthcare provider may adjust your due date based on ultrasound measurements.

What if I don't remember my last period?

If you don't remember your LMP, use the conception date method if you know when you conceived. Otherwise, your healthcare provider can date your pregnancy through an early ultrasound.

Can my due date change?

Yes, your healthcare provider may adjust your due date based on early ultrasound measurements, especially if there's a difference of more than 7 days from the calculated date based on your LMP.

What if I have irregular periods?

If your cycles are irregular or longer/shorter than 28 days, adjust the cycle length in the calculator. However, ultrasound dating may be more accurate for you.

When should I have my first prenatal appointment?

Most healthcare providers schedule the first prenatal visit between weeks 8-12 of pregnancy. Contact your provider as soon as you have a positive pregnancy test.

Is pregnancy really 9 months or 10 months?

Pregnancy is 40 weeks, which is approximately 9 months and 1 week (or about 10 lunar months). The "9 months" is simplified, but the actual duration is closer to 9.5 calendar months.

⚠️ Important Disclaimer

This pregnancy calculator is for informational and educational purposes only. It should not replace professional medical advice, diagnosis, or treatment.

Important points to remember:

  • The calculated due date is an estimate - only about 5% of babies arrive on their exact due date
  • Your healthcare provider may adjust your due date based on ultrasound measurements
  • Every pregnancy is unique and may progress differently
  • Always consult with qualified healthcare professionals for prenatal care
  • If you experience any concerning symptoms, contact your healthcare provider immediately

Seek immediate medical attention if you experience: severe abdominal pain, heavy bleeding, severe headaches, vision changes, reduced fetal movement, or any other concerning symptoms.