Pregnancy Calculator Weeks

Pregnancy Weeks Calculation:

\[ \text{Weeks Pregnant} = \left\lfloor \frac{\text{Current Date} - \text{LMP}}{7} \right\rfloor \]

Weeks Pregnant:

Total Days:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Pregnancy Calculator Weeks?

The Pregnancy Calculator Weeks estimates gestational age based on the last menstrual period (LMP). It calculates how many weeks and days pregnant you are, which is essential for tracking fetal development and scheduling prenatal care.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy dating formula:

\[ \text{Weeks Pregnant} = \left\lfloor \frac{\text{Current Date} - \text{LMP}}{7} \right\rfloor \]

Where:

\( \text{LMP} \) — First day of last menstrual period
\( \text{Current Date} \) — Today's date or any specified date
\( \left\lfloor \right\rfloor \) — Floor function (rounds down to nearest whole number)

Explanation: Pregnancy is traditionally calculated from the first day of the last menstrual period, approximately 2 weeks before conception occurs.

3. Importance of Pregnancy Dating

Details: Accurate pregnancy dating is crucial for monitoring fetal growth, scheduling prenatal tests, determining due date, and making important clinical decisions throughout pregnancy.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and the current date (or any date you want to check). The calculator will display weeks and days pregnant, plus total days since LMP.

5. Frequently Asked Questions (FAQ)

Q1: Why is pregnancy calculated from LMP instead of conception?
A: LMP is used because most women know when their last period started, while conception timing is often uncertain. This provides a standardized dating method.

Q2: How accurate is LMP dating?
A: LMP dating is generally accurate for women with regular 28-day cycles. Ultrasound dating may be more accurate if cycles are irregular or LMP is uncertain.

Q3: What if I don't remember my LMP exactly?
A: Use your best estimate. An early pregnancy ultrasound can provide more accurate dating if LMP is uncertain.

Q4: Does this calculator account for irregular cycles?
A: No, this calculator assumes a standard 28-day cycle. Women with irregular cycles may need ultrasound confirmation for accurate dating.

Q5: When should I see a healthcare provider?
A: Schedule your first prenatal appointment as soon as you suspect pregnancy, typically around 8 weeks gestation for initial confirmation and dating.