Our free pregnancy calculator helps you determine your estimated due date (EDD), calculate exactly how far along you are in weeks and days, identify your current trimester, and track important pregnancy milestones. Calculate from your last menstrual period (LMP), conception date, IVF transfer date, or ultrasound due date.
Only about 5% of babies are born on their exact due date. Most arrive within 2 weeks before or after.
Choose to calculate from LMP, conception date, IVF transfer, or known due date.
Enter the relevant date based on your selected method.
If your cycle differs from 28 days, enter your average cycle length.
See your due date, current week, trimester, and pregnancy timeline.
Naegele's Rule calculates due date by adding 280 days (40 weeks) to the first day of your last menstrual period. For conception date, add 266 days (38 weeks). Cycle length adjustments are made for cycles shorter or longer than 28 days.
Due Date = LMP + 280 days
The most accurate due date comes from an early ultrasound (before 12 weeks)
Only 5% of babies are born on their exact due date
Full-term pregnancy is between 39-40 weeks; early term is 37-38 weeks
First trimester: weeks 1-12, Second: weeks 13-26, Third: weeks 27-40
Conception typically occurs about 2 weeks after your last period
Longer menstrual cycles may shift your due date later
Our free pregnancy calculator helps you find your estimated due date, calculate exactly how many weeks and days pregnant you are, track your pregnancy progress through each trimester, and estimate your conception date. Works with LMP, conception date, IVF transfer, or ultrasound due date.
Calculate your pregnancy due date using the first day of your last menstrual period (LMP). Our calculator uses Naegele's Rule, adding 280 days (40 weeks) to your LMP. Adjust for your cycle length if it's different from the standard 28 days for more accurate results.
Find out exactly how many weeks and days pregnant you are today. Enter your LMP or due date and instantly see your current gestational age, trimester, and pregnancy progress percentage. Track your journey week by week.
Estimate when conception occurred based on your due date or LMP. Conception typically happens about 14 days after the start of your last period (at ovulation). Calculate backwards from your due date to find your approximate conception window.
Calculate your due date for IVF pregnancies using your embryo transfer date. The calculator adjusts based on whether you had a 3-day embryo or 5-day blastocyst transfer for accurate due date estimation.
Know which trimester you're in and track your progress through each stage. First trimester (weeks 1-12) covers early development, second trimester (weeks 13-26) brings visible growth, and third trimester (weeks 27-40) prepares for birth.
Data sourced from trusted institutions
All formulas verified against official standards.