1. What is Pregnancy Calculator?

The Pregnancy Calculator estimates the duration of pregnancy in weeks and days based on the Last Menstrual Period (LMP) and current date. This calculation is fundamental in obstetric care for tracking pregnancy progress.

2. How Does the Calculator Work?

The calculator uses the following formulas:

Where:

• LMP — First day of last menstrual period
• Current Date — Today's date or any date you want to check
• Weeks — Full weeks of pregnancy
• Days — Remaining days beyond full weeks

Explanation: The calculation counts the number of days between two dates and converts them into weeks and days format.

3. Importance of Pregnancy Dating

Details: Accurate pregnancy dating is crucial for proper prenatal care, timing of tests, and determining the expected delivery date. Most clinical decisions are based on gestational age.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period and the current date (defaults to today). The calculator will show how many weeks and days pregnant you are.

5. Frequently Asked Questions (FAQ)

Q1: What if I don't know my LMP?
A: If LMP is unknown, an ultrasound in early pregnancy can estimate gestational age. This calculator requires LMP for calculation.

Q2: Is this calculation accurate for all pregnancies?
A: This assumes a regular 28-day cycle with ovulation on day 14. Variations in cycle length may affect accuracy.

Q3: How is this different from gestational age?
A: This calculation gives gestational age, which is typically about 2 weeks more than fetal age (conception date).

Q4: What if my cycle isn't 28 days?
A: For cycles longer or shorter than 28 days, adjustments may be needed. Consult your healthcare provider.

Q5: When should I see a doctor?
A: Schedule your first prenatal visit as soon as you know you're pregnant, typically around 8 weeks gestation.