Easily calculate your pregnancy progress in weeks of amenorrhea (WA), gestational weeks (GW), months and trimester. Find out your estimated due date (EDD) and the percentage of pregnancy progression.
Enter the date of your last menstrual period (LMP) or the estimated conception date, then click the button to calculate your pregnancy progress. The tool will show you the number of weeks of amenorrhea (WA), gestational weeks (GW), month, trimester, progress percentage and estimated due date (EDD).
Calculating pregnancy weeks is an essential step for every expecting mother. Whether you just found out you're pregnant or want to track your baby's development week by week, our online pregnancy calculator lets you know exactly where you stand. In just a few clicks, discover your number of weeks of amenorrhea (WA), gestational weeks (GW), your pregnancy month, trimester and most importantly, your estimated due date (EDD).
Knowing exactly your number of pregnancy weeks is fundamental for several reasons. It's not just about satisfying curiosity: it's a real pregnancy tracking tool that directly impacts the health of both mother and baby.
The pregnancy calendar is directly linked to the schedule of mandatory and recommended medical examinations. Each prenatal consultation is scheduled according to the number of weeks of amenorrhea:
Each week of pregnancy corresponds to a key stage in embryonic and fetal development:
Weeks of amenorrhea are calculated from the first day of the last menstrual period. This is the method used by healthcare professionals because the date of the last period is generally known with precision. A pregnancy lasts approximately 40 weeks of amenorrhea (280 days).
Gestational weeks are calculated from the presumed date of conception, approximately 14 days after the start of the last period. The pregnancy thus lasts about 38 gestational weeks. The formula is simple: GW = WA - 2.
The estimated due date is calculated by adding 280 days (40 weeks) to the first day of the last menstrual period. This method, known as Naegele's rule, is the most commonly used by healthcare professionals.
It's important to note that the EDD is an estimate. Only 4-5% of babies are born on the exact due date. Most births occur between weeks 38 and 42.
| Month | Weeks of Amenorrhea (WA) | Gestational Weeks (GW) | Trimester |
|---|---|---|---|
| 1st month | 3 to 6 WA | 1 to 4 GW | 1st trimester |
| 2nd month | 7 to 10 WA | 5 to 8 GW | 1st trimester |
| 3rd month | 11 to 15 WA | 9 to 13 GW | 1st trimester |
| 4th month | 16 to 19 WA | 14 to 17 GW | 2nd trimester |
| 5th month | 20 to 24 WA | 18 to 22 GW | 2nd trimester |
| 6th month | 25 to 28 WA | 23 to 26 GW | 2nd trimester |
| 7th month | 29 to 32 WA | 27 to 30 GW | 3rd trimester |
| 8th month | 33 to 36 WA | 31 to 34 GW | 3rd trimester |
| 9th month | 37 to 41 WA | 35 to 39 GW | 3rd trimester |
To know how many weeks pregnant you are, simply count the number of days since the first day of your last menstrual period and divide by 7. This gives you the weeks of amenorrhea. For gestational weeks, subtract 2 weeks. Our calculator does this automatically.
WA (weeks of amenorrhea) count from the first day of the last period, while GW (gestational weeks) count from the date of conception. There is always a 2-week gap: GW = WA - 2.
The estimated due date (EDD) is based on an average pregnancy duration of 280 days. In reality, a delivery is considered full-term between 37 and 42 weeks. The EDD can be refined by the dating ultrasound performed in the first trimester.
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