Pregnancy Week by Week Calculator + Tracker (Find What Week You Are)

✔ Find your exact pregnancy week instantly ✔ Track baby growth week by week

Enter LMP or due date to get current pregnancy week, trimester, and what to expect.

Pregnancy Week Calculator: What Week of Pregnancy Am I?

You can calculate your pregnancy week by counting from the first day of your last menstrual period (LMP).

Pregnancy lasts about 40 weeks, and your current week depends on how many days have passed since your LMP or due date.

How to Calculate Pregnancy Week by Week

To calculate your pregnancy week:

Our pregnancy week calculator does this automatically and also shows your trimester and baby development.

Track Your Pregnancy Week by Week

Tracking your pregnancy week helps you understand your baby’s growth, symptoms, and important milestones.

You can use this pregnancy week tracker to monitor your progress from week 1 to week 40.

How Many Weeks Pregnant Am I Today?

You can find how many weeks pregnant you are by entering your last menstrual period (LMP) or due date into the calculator above.

This pregnancy week calculator shows your exact week, trimester, and baby development stage.

Pregnancy Week Calculator

About This Pregnancy Week Calculator

Tracking your pregnancy week helps you understand fetal development, plan tests, and anticipate symptoms. This Pregnancy Week Calculator converts LMP or due date into the current gestational age and trimester. Each week brings new milestones—from heartbeat detection to fetal movement. Use our pregnancy week-by-week calendar to see detailed development notes, checklists, and suggested prenatal tests.

Weekly highlight: Pregnancy is divided into three trimesters:

Each stage has unique developments and considerations for both mother and baby.

Baby Gender Prediction

Many parents are curious about their baby's gender during pregnancy. While the most accurate methods are medical (ultrasound and NIPT), there are several traditional methods people enjoy for fun:

  • Ultrasound: 95-99% accurate at 18-20 weeks
  • NIPT: 99% accurate from 9 weeks
  • Nub Theory: 75% accurate at 12-14 weeks
  • Chinese Gender Chart: Traditional method
  • Shettles Method: Based on timing of conception
  • Heart Rate Method: Based on fetal heart rate

For detailed information about these methods, including accuracy rates and how they work, visit Baby Gender Prediction Methods.

Related Tools

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Pregnancy Calendar

Explore a full pregnancy week-by-week timeline with week-by-week fetal growth and symptoms.

Frequently Asked Questions

What counts as week 1?

Pregnancy weeks are counted from the first day of your last menstrual period (LMP), not from conception. This means that week 1 and week 2 are technically before conception occurs. This method is used because the exact date of conception is often unknown.

When is the first trimester?

The first trimester includes weeks 1 through 12 of pregnancy. This is a critical period for fetal development when major organs and systems are forming. It's also when many women experience early pregnancy symptoms like nausea and fatigue.

How is gestational age different from fetal age?

Gestational age is measured from the first day of the last menstrual period and is typically about 2 weeks longer than fetal age, which is measured from conception. Healthcare providers usually refer to gestational age when discussing pregnancy milestones.

Can I track symptoms by week?

Yes, many pregnancy symptoms are associated with specific weeks or trimesters. For example, morning sickness often occurs during the first trimester, while fetal movement is typically felt during the second trimester. However, every pregnancy is unique, and experiences can vary.

How accurate is week calculation?

Week calculation based on LMP is generally accurate for women with regular 28-day cycles. For those with irregular cycles or uncertain LMP, ultrasound measurements can provide more accurate dating. Your healthcare provider may adjust your due date based on ultrasound findings.

How many weeks pregnant am I today?

You can calculate how many weeks pregnant you are by counting from the first day of your last menstrual period (LMP). Our pregnancy week calculator automatically shows your current week and trimester.