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Pregnancy Calculator

Calculate your due date, track current week of pregnancy, and get week-by-week baby development information. Perfect for expecting parents.

Calculate Your Pregnancy Timeline

Enter your information to calculate due date and track pregnancy progress.

Calculate Due Date

Based on your last menstrual period (LMP) or conception date.

days
Typically 28 days, but can vary

Calculate Current Week

Find out which week of pregnancy you're in based on due date or LMP.

Calculate Conception Date

Estimate when conception likely occurred based on due date or LMP.

Pregnancy Calculation Results

Due Date
Estimated delivery date
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Current Week
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Days Pregnant
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Trimester
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Weeks to Go
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Pregnancy Timeline

1st Trimester
Weeks 1-13
2nd Trimester
Weeks 14-27
3rd Trimester
Weeks 28-40
You are here

This Week's Development

Important Dates

📅
First Trimester Ends
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👶
Gender Visible (Ultrasound)
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🏥
Third Trimester Begins
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🎉
Full Term (37 Weeks)
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Pregnancy Tips

  • 🍎

    Nutrition

    Focus on folic acid, iron, calcium, and protein. Avoid raw fish and unpasteurized dairy.

  • 🚶‍♀️

    Exercise

    Moderate exercise like walking and swimming is beneficial. Consult your doctor.

  • 😴

    Rest

    Get plenty of sleep. Use pillows for support as pregnancy progresses.

  • 📋

    Checkups

    Regular prenatal visits are crucial. Track baby's growth and your health.

Related Calculators

Key Milestones

Week 8
Heartbeat detectable
Week 12
First trimester ends
Week 20
Anatomy scan
Week 24
Viability begins
Week 28
Third trimester begins
Week 37
Full term

Understanding Pregnancy Calculations

Pregnancy calculations help expecting parents track fetal development, prepare for birth, and understand the timeline of this incredible journey. Our calculator uses standard medical formulas to provide accurate estimates.

How Due Dates Are Calculated

Medical professionals use several methods to estimate due dates:

1. Naegele's Rule (Standard Method)

Due Date = LMP + 280 days

Where LMP is the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14.

2. Adjusting for Cycle Length

Due Date = LMP + 280 days + (Cycle Length - 28)

For cycles longer or shorter than 28 days, adjust accordingly.

3. From Conception Date

Due Date = Conception Date + 266 days

266 days is the average gestation period from conception.

Pregnancy Trimesters Explained

Trimester Weeks Key Developments Common Symptoms
First 1-13 Organ formation, heartbeat begins Morning sickness, fatigue, breast tenderness
Second 14-27 Rapid growth, movement felt, gender visible Increased energy, back pain, leg cramps
Third 28-40 Brain development, fat accumulation, lung maturation Braxton Hicks, swelling, difficulty sleeping

Important Pregnancy Milestones

Week 4

Positive Pregnancy Test

Home pregnancy tests become accurate around the time of your missed period.

Week 8-12

First Prenatal Visit

Confirm pregnancy, estimate due date, and discuss prenatal care.

Week 18-22

Anatomy Scan

Detailed ultrasound to check baby's development and often reveal gender.

Week 24

Viability Milestone

Baby has a chance of survival outside the womb with medical help.

Week 28

Third Trimester Begins

Start of the final stretch. Prenatal appointments become more frequent.

Week 37

Full Term

Baby is considered full term and could arrive any time.

Frequently Asked Questions

How accurate are due date calculations?
Only about 4% of babies are born on their exact due date. Most arrive between 37-42 weeks. Due dates are estimates, not deadlines.
Why is pregnancy counted from last period?
Most women know their LMP date but not conception date. It's a consistent starting point that adds about 2 weeks before conception.