How Many Weeks Pregnant Are You?
Calculate your due date and track your pregnancy progress with our free calculator
Enter Your Information
Your Pregnancy Progress
Enter your last menstrual period date and cycle length to calculate how many weeks pregnant you are and your estimated due date.
Your results will appear here
Pregnancy Calculator FAQs
Pregnancy is calculated from the first day of your last menstrual period (LMP), not from the date of conception. This is because it's often difficult to determine the exact conception date, while the LMP is easier to identify.
This calculator provides an estimate based on standard pregnancy calculations. Most pregnancies last about 40 weeks from the LMP. However, only your healthcare provider can give you an accurate due date based on ultrasound measurements and other factors.
If you don't know your LMP, your healthcare provider can estimate your due date using an ultrasound. The most accurate time for dating a pregnancy is between 8-12 weeks gestation when measurements are most reliable.
Pregnancy is divided into three trimesters:
- First trimester: Weeks 1-13
- Second trimester: Weeks 14-27
- Third trimester: Weeks 28-40+