Pregnancy Calculator & Tracker
Calculate your due date and track your pregnancy journey
Pregnancy Details
Estimated Due Date
Current Week
Trimester
Days Remaining
Pregnancy Timeline
Calculate due date to see pregnancy timeline
What is a Pregnancy Calculator?
A pregnancy calculator is a helpful tool for expectant parents to estimate their due date and track the progress of their pregnancy. By entering the first day of your last menstrual period or conception date, our calculator provides an estimated due date, current week of pregnancy, trimester information, and a detailed timeline of fetal development.
Our comprehensive pregnancy calculator goes beyond basic due date estimation, offering valuable information about each stage of pregnancy, developmental milestones, and what to expect throughout this incredible journey.
Why Use Our Pregnancy Calculator?
Accurate Due Date
Get a reliable estimated due date based on medical calculation methods
Weekly Updates
Track your baby’s development week by week with detailed information
Fully Responsive
Access your pregnancy information on any device – desktop, tablet, or mobile
Privacy Focused
Your data never leaves your browser – all calculations happen locally
How to Use Our Pregnancy Calculator
Select Calculation Method
Choose between Last Menstrual Period (LMP), conception date, or ultrasound date
Enter Date
Input the relevant date based on your selected calculation method
Adjust Cycle Length (Optional)
Modify if your menstrual cycle is longer or shorter than 28 days
Calculate
Click calculate to see your due date and pregnancy details
Pregnancy Timeline Overview
Pregnancy is typically divided into three trimesters, each with distinct developmental milestones:
- First Trimester (Weeks 1-13): Major organs and structures form; morning sickness common
- Second Trimester (Weeks 14-27): Baby’s movements felt; gender often detectable
- Third Trimester (Weeks 28-40+): Rapid growth; preparation for birth
Important Pregnancy Milestones
Throughout pregnancy, several key milestones mark your baby’s development:
- Week 5: Baby’s heart begins to beat
- Week 12: Heartbeat detectable with Doppler
- Weeks 18-22: Feel baby’s first movements (quickening)
- Week 28: Eyes open; respond to light and sound
- Week 36: Baby typically moves into head-down position
Frequently Asked Questions
Our calculator uses standard medical formulas to estimate your due date. Typically, a due date calculated from LMP is accurate within ±5 days. However, only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated date.
Gestational age is measured from the first day of your last menstrual period (LMP), while fetal age (also called embryonic age) is measured from the actual date of conception. Gestational age is typically about two weeks longer than fetal age. Medical professionals use gestational age for consistency.
The standard pregnancy calculation assumes a 28-day cycle with ovulation on day 14. If your cycle is longer or shorter, you can adjust the cycle length in our calculator for a more accurate due date estimation. Longer cycles typically result in a slightly later due date, while shorter cycles may result in an earlier due date.
No, all calculations are performed locally in your browser. We don’t collect or store any of your personal data, ensuring complete privacy and security for your pregnancy information.
Yes, you can use your browser’s print function to print the results or save them as a PDF. The pregnancy timeline can also be screenshotted for sharing with your partner or healthcare provider.