Pregnancy Calculator
Calculate your due date, current pregnancy week, trimester information, and important milestone dates for a healthy pregnancy journey.
Pregnancy Information
1st Trimester
Weeks 1-122nd Trimester
Weeks 13-273rd Trimester
Weeks 28-40Pregnancy Timeline:
Important Milestones:
First Trimester Screening
Weeks 11-14: NT scan and blood tests
Anatomy Scan
Weeks 18-22: Detailed ultrasound examination
Glucose Screening
Weeks 24-28: Gestational diabetes test
Third Trimester Monitoring
Weeks 32+: More frequent checkups
Weekly Development:
At 20 weeks, your baby is about the size of a banana and weighs approximately 10 ounces. Major organs are developing rapidly.
About
Our Pregnancy Calculator provides accurate estimations of due dates, current pregnancy week, and important milestone dates to help expectant parents track their pregnancy journey.
Why Choose
Multiple calculation methods including LMP, conception date, ultrasound results, and known due dates with comprehensive trimester information and milestone tracking.
Features
Visual pregnancy timeline, trimester indicators, important milestone dates, weekly development information, and customizable cycle length for accurate calculations.
Benefits
Better pregnancy planning, appointment scheduling, understanding fetal development stages, tracking important medical tests, and preparing for each trimester.
Choose Method
Select your preferred calculation method: last menstrual period, conception date, known due date, or ultrasound results for accurate estimation.
Enter Date
Input the relevant date information and customize cycle length if using LMP method. The calculator accommodates various cycle lengths for accuracy.
Track Progress
View your complete pregnancy timeline with current week, trimester information, important milestones, and weekly development details.
Frequently Asked Questions - Pregnancy Calculator
The calculator provides estimates based on standard 280-day (40-week) pregnancy duration from the last menstrual period. It's approximately 80% accurate for natural conception, but actual due dates can vary by ±2 weeks. Ultrasound dating, especially in the first trimester, is generally more accurate than LMP calculations.
LMP (Last Menstrual Period) is the most common method, adding 280 days to your last period. Conception date adds 266 days from fertilization. Ultrasound dating is most accurate early in pregnancy. Known due date works backward from a date given by your healthcare provider. Each method has different accuracy levels depending on your specific situation.
First trimester: Weeks 1-12 (early development, morning sickness). Second trimester: Weeks 13-27 (often called the "golden period"). Third trimester: Weeks 28-40 (rapid growth, preparation for birth). Each trimester has distinct characteristics and milestone medical appointments.
Key milestones include: First prenatal visit (8-10 weeks), first trimester screening (11-14 weeks), anatomy scan (18-22 weeks), glucose screening (24-28 weeks), third trimester monitoring (32+ weeks), and full-term delivery (37-42 weeks). Each milestone has specific purposes for monitoring maternal and fetal health.
Due dates may be adjusted based on ultrasound measurements, especially early dating scans which are more accurate than LMP calculations. Factors like irregular cycles, uncertain LMP dates, or fetal growth measurements can lead to date adjustments. Most healthcare providers use the most accurate dating method available, typically early ultrasound results.