🤰 Due Date Calculator
Find out your estimated due date and track key pregnancy milestones. Just enter the first day of your last period to begin.
📅 Calculation Details
👶 Your Pregnancy Timeline
Your Estimated Due Date is
🗓️ Key Milestones
- Est. Conception Date: February 3, 2026
- End of 1st Trimester: April 27, 2026
- End of 2nd Trimester: August 3, 2026
This is an estimate. Please consult your healthcare provider for an official due date.
A Glance at the Trimesters
First Trimester (Wk 1-13)
The foundational period. Major organs and body systems form. Morning sickness and fatigue are common.
Second Trimester (Wk 14-27)
Often called the "honeymoon" phase. You may feel more energetic, and baby's movements can often be felt for the first time.
Third Trimester (Wk 28-40+)
The final stretch. Baby grows rapidly, gaining weight and preparing for birth. Rest is crucial as your body prepares for labor.
📖 How Is Your Due Date Calculated?
A pregnancy due date is most commonly estimated using Naegele's rule, which adds 280 days (40 weeks) to the first day of your last menstrual period (LMP). This method assumes a standard 28-day menstrual cycle with ovulation occurring on day 14. Since not every person has a textbook cycle, our calculator lets you adjust for your actual average cycle length, shifting the estimated conception date and due date accordingly.
It's important to understand that a due date is an estimate, not a deadline. Full term is considered anywhere from 39 weeks to 40 weeks and 6 days. Babies born between 37 and 38 weeks and 6 days are "early term," and those born at 41 weeks or later are "late term" or "post-term." Each pregnancy is unique, and your healthcare provider will monitor your progress to determine the best plan for you and your baby.
An early ultrasound (typically performed between 8 and 12 weeks) is the gold standard for confirming or adjusting your due date. The crown-rump length (CRL) measurement taken during this scan is highly accurate. If the ultrasound date and the LMP-based date differ by more than a week, your provider may revise your estimated due date.
Beyond the due date, this calculator shows you key pregnancy milestones — like when each trimester ends and an estimated conception window — to help you feel prepared for the exciting journey ahead. Consider sharing these dates with your partner, family, and healthcare team so everyone is on the same timeline.