Pregnancy Due Date Calculator

Pregnancy Due Date Calculator

Our Pregnancy Due Date Calculator helps you estimate the expected date of delivery (EDD) based on your Last Menstrual Period (LMP), Date of Conception, or IVF Transfer Date. Whether you’re newly pregnant or planning, this tool offers accurate insights into your pregnancy journey.

How to Use?

• Select your preferred calculation method: LMP, Conception Date, or IVF Transfer Date.
• Enter the appropriate date using the calendar picker.
• The calculator will instantly display your estimated due date, current pregnancy week, trimester, and the number of days left.
• Use the visual progress bar to track how far along you are in your pregnancy.

Key Features

• Supports LMP, Conception, and IVF calculation methods
• Real-time due date estimation
• Displays gestational age in weeks and trimesters
• Interactive status bar showing pregnancy progress
• Mobile-friendly and easy to use
• Clear visual and text output

Try Calculator A2Z’s Random Number Generator Calculator

Formula Used

For LMP: Due Date = LMP Date + 280 days (40 weeks)
For Conception: Due Date = Conception Date + 266 days
For IVF (Day 3 Transfer): Due Date = Transfer Date + 263 days
For IVF (Day 5 Transfer): Due Date = Transfer Date + 261 days

Example

Suppose your last menstrual period started on January 1st. The calculator adds 280 days to give an estimated due date around October 7th. It also shows you’re currently in the second trimester and approximately 24 weeks pregnant with about 16 weeks remaining.

Understanding Pregnancy and Baby Development

Pregnancy typically lasts about 40 weeks from the first day of your last period. It is divided into three trimesters –

• First Trimester (Weeks 1–12): Crucial development of the brain, spinal cord, and organs
• Second Trimester (Weeks 13–26): Baby starts moving, organs mature further, and gender may be visible
• Third Trimester (Weeks 27–40): Baby gains weight rapidly, lungs mature, and preparation for birth begins

Tracking development week by week helps parents understand what’s happening inside and how to support their baby’s health through proper nutrition and regular check-ups.

Benefits

• Helps expectant parents plan prenatal appointments
• Enables better health monitoring and nutritional planning
• Offers peace of mind with precise pregnancy tracking
• Can be used for IVF or natural conception cases

Limitations

• The due date is an estimate — actual delivery may vary by 1–2 weeks
• Not suitable for irregular cycles without medical advice
• Always consult with your healthcare provider for personalized care

Pregnancy Week-by-Week Guide

Pregnancy is a beautiful and transformative journey lasting around 40 weeks. Here’s what typically happens during each week of pregnancy, helping you understand your baby’s development and your body’s changes.

First Trimester (Week 1–12)

Week 1–2

Technically, you’re not pregnant yet! These weeks are part of your menstrual cycle, and ovulation occurs near the end of Week 2.

Week 3

Fertilization occurs. The sperm meets the egg, and the tiny bundle of cells (zygote) begins its journey to the uterus.

Week 4

The embryo implants in the uterus. You might miss your period and experience light spotting. Hormonal changes begin.

Week 5

Pregnancy can now be confirmed with a test. The embryo is the size of a sesame seed. The heart and circulatory system begin forming.

Week 6

Your baby’s heartbeat can often be detected via ultrasound. Major organs start developing. Morning sickness might begin.

Week 7

The embryo grows rapidly, and limb buds start appearing. The uterus starts expanding slightly.

Week 8

The embryo now has visible arms and legs. Facial features begin forming.

Week 9

Now officially called a fetus. Organs continue to grow. You may feel fatigued and moody.

Week 10

Vital organs are in place. Fingernails and hair follicles begin to develop.

Week 11

External genitals begin to form. Your baby is about the size of a fig.

Week 12

Most critical development is complete. The risk of miscarriage decreases. Your baby can move, but you won’t feel it yet.

Second Trimester (Week 13–26)

Week 13

Your baby’s fingerprints form. Hormones stabilize; you may feel better.

Week 14

The baby begins to swallow and make facial expressions. You may begin showing a bump.

Week 15

The baby’s skeleton begins to harden from cartilage to bone.

Week 16

You may feel the first flutters of movement known as “quickening.”

Week 17

The baby starts putting on fat. The placenta is fully functional.

Week 18

Facial features become more defined. A detailed anatomy scan may be scheduled soon.

Week 19

Vernix caseosa (a waxy protective coating) begins forming on your baby’s skin.

Week 20

Halfway there! A mid-pregnancy ultrasound can reveal the baby’s gender.

Week 21

The baby begins absorbing nutrients through the digestive system.

Week 22

Facial features and senses continue developing. Eyelids, eyebrows, and hair are visible.

Week 23

Hearing is well developed. Baby can respond to your voice and external sounds.

Week 24

Baby’s lungs and other organs continue to mature. Viability outside the womb begins around now (though still risky).

Week 25

Baby’s skin is wrinkled and pink. You might experience leg cramps or backaches.

Week 26

Eyes begin to open. Lungs produce surfactant for breathing.

Third Trimester (Week 27–40)

Week 27

The brain is developing rapidly. Baby responds to touch and sound.

Week 28

The baby begins to turn head down. You may notice Braxton Hicks contractions.

Week 29

Fat stores increase. Baby’s bones are fully developed but still soft.

Week 30

Baby’s vision improves. You may feel heavier and more tired.

Week 31

The baby gains more control over body movements. Sleeping patterns emerge.

Week 32

Lanugo (fine hair) begins to shed. Baby prepares for birth.

Week 33

The skull remains soft to ease delivery. You might notice swelling in your hands or feet.

Week 34

The central nervous system continues maturing. Baby’s immune system strengthens.

Week 35

The baby starts practicing breathing. The head might move deeper into the pelvis.

Week 36

Lungs are nearly fully developed. You might experience more frequent urination.

Week 37

Considered early full-term. Baby continues to gain weight rapidly.

Week 38

Organs are ready for life outside. Vernix and lanugo are mostly gone.

Week 39

Full-term pregnancy. Baby’s brain and lungs continue to mature until delivery.

Week 40

Estimated due date! Only 5% of babies are born exactly on this date. Labor could begin any day.

Beyond 40 Weeks

If pregnancy extends past Week 40, doctors may consider inducing labor. Regular monitoring becomes important.

This week-by-week guide is intended for informational purposes. Always consult your healthcare provider for personalized advice and prenatal care.

FAQs

1. Can I use this calculator if I don’t remember my LMP?
Yes, you can use the Conception Date or IVF Transfer Date options.

2. Is the due date guaranteed?
No. It’s a medically accepted estimate, but actual delivery may differ by a few days.

3. What if I have a shorter or longer cycle?
The calculator assumes a 28-day cycle. Consult your doctor for personalized adjustments.

4. Can I share my due date with others?
Absolutely! Use the share button to send your result via social media or messaging apps.

Conclusion

This Pregnancy Due Date Calculator is a helpful tool for tracking your pregnancy journey with clarity and confidence. Stay informed, stay healthy, and enjoy this beautiful phase of life. For the most accurate results, always follow up with your healthcare provider.