A pregnancy calculator is a simple tool used to estimate your baby’s due date and track how far along your pregnancy is. Healthcare providers commonly measure pregnancy starting from the first day of your last menstrual period (LMP), and a full-term pregnancy is typically around 40 weeks (280 days) from that date.
This calculator helps you find your estimated due date, your current pregnancy week, and which trimester you are in. It is designed for general information and planning purposes. Since every pregnancy is different, the results are estimates and may not reflect the exact delivery date.
How This Pregnancy Calculator Works
This calculator estimates pregnancy progress using the first day of your last menstrual period (LMP). In standard medical practice, pregnancy is counted from this date rather than the conception date. A full-term pregnancy is considered to be approximately 40 weeks (280 days) from the LMP.
The calculator adds 280 days to your LMP date to estimate your due date. It also compares your LMP date with today’s date to determine how many weeks pregnant you are. Based on the number of weeks, your pregnancy stage is grouped into trimesters:
• First Trimester: Week 1–12
• Second Trimester: Week 13–27
• Third Trimester: Week 28–40
Because menstrual cycles, ovulation timing, and individual health factors vary, the result should be considered an estimate and not an exact prediction.