Pregnancy Calculator

Enter the first day of your last menstrual period
Select your typical menstrual cycle length
Enter the date you believe conception occurred
Enter the date of your ultrasound
Enter the gestational age from ultrasound

Pregnancy Results

Week 12
First Trimester
You're in your first trimester
Jan 15, 2024
Due Date
12 weeks
Weeks Pregnant
84 days
Days Pregnant
1st
Trimester

Pregnancy Timeline

1
2
3
1st Tri
2nd Tri
3rd Tri

Fetal Development

Week 12 Development

Your baby is now about the size of a plum. All vital organs are formed and beginning to function. Fingers and toes have separated, and hair follicles are forming. The baby can make movements, though you won't feel them yet.

Length: About 2.1 inches (5.4 cm) | Weight: About 0.5 ounce (14 grams)

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Pregnancy Calculator Guide

What is a Pregnancy Calculator?

A pregnancy calculator helps expectant parents track their pregnancy progress, estimate their due date, and learn about fetal development week by week. It's an essential tool for monitoring pregnancy milestones and preparing for the baby's arrival.

Our pregnancy calculator uses medical standards to provide accurate estimates based on your last menstrual period, conception date, or ultrasound data.

How is Pregnancy Calculated?

Pregnancy is typically calculated from the first day of your last menstrual period (LMP), even though conception usually occurs about two weeks later. This method is used because it's often difficult to pinpoint the exact date of conception.

Due Date = LMP + 280 days
Due Date = LMP + 40 weeks

For women with regular 28-day cycles, this calculation is straightforward. For those with longer or shorter cycles, adjustments can be made:

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

Our calculator automatically handles these adjustments based on your cycle length.

Pregnancy Trimesters

First Trimester (Weeks 1-12)

The first trimester is a period of rapid development. All major organs form during this time. Common symptoms include morning sickness, fatigue, and breast tenderness.

Second Trimester (Weeks 13-27)

Often called the "golden period" of pregnancy, many women feel their best during the second trimester. The baby grows significantly, and most women begin to feel movement.

Third Trimester (Weeks 28-40+)

The final stretch of pregnancy. The baby gains weight rapidly, and organs mature in preparation for birth. Common symptoms include back pain, frequent urination, and Braxton Hicks contractions.

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