Enter Your Details
Based on your last menstrual period (LMP)
Enter your LMP to track pregnancy week by week.
About Pregnancy Calculator
A pregnancy week calculator estimates gestational age and trimester from your last menstrual period (LMP) and average cycle length.
It is an educational estimate. Dating ultrasounds and clinician guidance provide the most reliable pregnancy timeline.
Quick tips
- Use the first day of your last period as LMP
- Irregular cycles may need clinician dating
- Seek medical care for symptoms or concerns