Pregnancy Calculator - Week by Week
Track your pregnancy week by week. Calculate your due date from LMP and see which trimester you are in.
Standard is 28 days.
Select your LMP date
We'll calculate your due date and current progress.
This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
The Three Trimesters
First Trimester (Weeks 1-12)
The baby's body structure and organ systems develop. Most miscarriages occur during this period. Symptoms include nausea, fatigue, and breast tenderness.
Second Trimester (Weeks 13-26)
Often called the "honey moon phase". Nausea usually subsides, and you may feel the baby move ("quickening"). The sex of the baby can often be determined by ultrasound.
Third Trimester (Weeks 27-40)
The baby grows rapidly and gains weight. You may feel more uncomfortable as the uterus puts pressure on other organs. The baby moves into a head-down position for birth.
How is Due Date Calculated?
Doctors typically count 40 weeks (280 days) from the first day of your Last Menstrual Period (LMP). However, conception usually happens about 2 weeks after the LMP. This means for the first 2 weeks of your pregnancy, you weren't actually pregnant yet!
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