Pregnancy Due Date Calculator
Calculate your estimated due date, how many weeks pregnant you are, and key pregnancy milestones — all in one place.
🤰 Calculate Your Due Date
Choose your method and enter your date to get your estimated due date and pregnancy timeline.
How is Your Due Date Calculated?
Your estimated due date (EDD) is one of the first things you’ll want to know after confirming a pregnancy. Most pregnancies last approximately 40 weeks (280 days) from the first day of the last menstrual period. Our Pregnancy Due Date Calculator gives you your EDD instantly, along with your current pregnancy week, trimester, and key milestones to look forward to.
Naegele’s Rule
The most common method for calculating a due date is Naegele’s Rule: take the first day of your last menstrual period, add one year, subtract three months, and add seven days. This is equivalent to adding 280 days (40 weeks) to your LMP date. It assumes a standard 28-day cycle with ovulation on day 14.
The Three Trimesters
- First Trimester (Weeks 1–12): Major organ development. Most miscarriages occur in this period. Morning sickness is common.
- Second Trimester (Weeks 13–26): Often called the “golden period.” Energy typically returns, and the baby’s movements become felt.
- Third Trimester (Weeks 27–40): Rapid baby growth. Preparation for birth begins.
IVF Due Date Calculation
For IVF pregnancies, the due date is calculated from the egg retrieval date. For a Day 5 blastocyst transfer, subtract 5 days from the transfer date to get the equivalent LMP date, then add 280 days. For a Day 3 transfer, subtract 3 days instead.