1. What is the Due Date Calculator?

The Due Date Calculator estimates your expected delivery date based on your last menstrual period (LMP) and calculates how many weeks pregnant you are based on the current date. It uses the standard 280-day (40-week) pregnancy duration.

2. How Does the Calculator Work?

The calculator uses two simple formulas:

Where:

• LMP — First day of your last menstrual period
• Current Date — Today's date or any date you want to check
• 280 days — Standard duration of pregnancy (40 weeks)

Explanation: Pregnancy is typically calculated from the first day of your last period, not from conception, because most women can more accurately recall this date.

3. Importance of Due Date Calculation

Details: Knowing your due date helps with prenatal care scheduling, monitoring fetal development, and preparing for delivery. Tracking pregnancy weeks is important for understanding which developmental milestones to expect.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and either today's date or any date you want to check. The calculator will show your estimated due date and how many weeks pregnant you are/were on that date.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the due date calculation?
A: Only about 5% of women deliver on their exact due date. Most deliver within 2 weeks before or after.

Q2: What if I don't know my LMP?
A: An early ultrasound can provide a more accurate due date estimation if you're unsure of your LMP.

Q3: Why 280 days?
A: This is based on the average 40-week pregnancy duration, counting from the first day of the last menstrual period.

Q4: Does this work for irregular cycles?
A: The calculation assumes a 28-day cycle. If your cycles are significantly longer or irregular, consult your healthcare provider.

Q5: What's considered full term?
A: Between 37 weeks and 41 weeks and 6 days. Babies born before 37 weeks are considered premature.