pregnancy weeks

How many weeks Pregnant?

Fetal Development
over the weeks and months
weeks pregnant


Weeks, Months and Trimesters Guides

Your Weekly Guide  Your Monthly Guide Your Trimester Guide
How many weeks pregnant am I ? Pregnancy weeks calculator

To find out how many weeks pregnant you are:

Use the first day of your last menstrual cycle (LMP) to work out when you most likely conceived, how many weeks pregnant you are, and when your baby's birth is expected. If you don't know the length of your cycle, leave that box as 28 and the average 28 days will be used to calculate your information.


Pregnancy Weeks and Due Date Calculator:

week by weekpregnancy weeks

  Month   Day   Year

how pregnant am i Last Menstrual Period:   baby
Average Length of Cycles:
(22 to 40) (defaults to 28) 
weeks calculate

Estimated Conception: weeks fetus
Estimated Due Date: size time
Since LMP: week by week fetal age
pregnant date
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The Fetal Development information is used as a general guide for healthy pregnancy development, this development may vary due to the mother's health or a miscalculation of ovulation. Gestational age is the age of the pregnancy from the last normal menstrual period (LMP), and fetal age is the actual age of the growing baby.

Most references to pregnancy are usually in gestational age rather than fetal age development, but we have included both so that it is clear what stage development is at. Measurements given are a total length from crown to rump (CRL) or [head to buttucks] up to week 20, and after week 20 they are given as head to heel. Each pregnancy can differ in weight and length measurements, and those given are just a general guideline.

Pregnancy is also divided into trimesters which last about 12 - 14 weeks each (depending on source). Similar to development, these can be calculated from different dates so not all trimester calculations will equal the same. The information here divides the three trimesters into 3 completed months each. The first trimester is week 1 through to the end of week 13. The second trimester usually ends around the 26th week and consists of the 4th, 5th and 6th completed months. The third trimester can end anywhere between the 38th - 42nd week and is the 7th, 8th and 9th completed months of pregnancy.



Pregnancy Calendar Week By Week

First Trimester

Week 1   Week 2   Week 3   Week 4   Week 5   Week 6   Week 7  
Week 8   Week 9   Week 10   Week 11   Week 12   Week 13

Second Trimester

Week 14   Week 15   Week 16   Week 17   Week 18   Week 19   Week 20  
Week 21   Week 22   Week 23   Week 24   Week 25   Week 26

Third Trimester

Week 27   Week 28   Week 29   Week 30   Week 31   Week 32   Week 33  
Week 34   Week 35   Week 36   Week 37   Week 38   Week 39   Week 40


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