Pregnancy Due Date Calculator

Our Pregnancy Due Date Calculator uses peer-reviewed, medical guidelines to give you an accurate window for your baby’s arrival. We take the first day of your last menstrual period (LMP) plus your cycle length to estimate your due date—and back it up with decades of obstetric research.

How to Use This Calculator

1. Enter Your LMP
   – Select the first day of your most recent period.
2. Adjust Cycle Length
   – The default is 28 days. Change it if your cycles are shorter or longer on average.
3. Click Calculate
   – Instantly see your EDD, weeks pregnant, and more.

Your Results Explained

• Estimated Due Date (EDD)
  We calculate this by adding 280 days (40 weeks) to your LMP, then adjusting for your cycle length.
• Weeks Pregnant
  How many weeks have passed since your LMP.
• Trimester
  • First: up to 12 weeks
  • Second: 13–26 weeks
  • Third: 27–40 weeks
• Baby Size & Weight
  Approximate length and weight for your current gestational week.
• Estimated Conception Date
  Typically about 14 days after your LMP.
• Pregnancy Progress
  A percentage of your progress through a standard 40-week pregnancy timeline.
• Suggested Test Date
  If you’re confirming early pregnancy, we’ll recommend this as the optimal day to test.

Pregnancy Terms at a Glance

Note: Your EDD is a guideline—only about 5 % of babies are born exactly on that date. Plan for a “due date range” two weeks before to two weeks after your calculated date, and always confirm your timeline with your healthcare provider.