Home
Back
Pregnancy Calculation Formula:
| From: | To: |
The Pregnancy Calculator estimates gestational age in weeks based on the last menstrual period (LMP) date. It provides a quick and accurate assessment of pregnancy duration, which is essential for prenatal care and monitoring fetal development.
The calculator uses the standard pregnancy calculation formula:
Where:
Explanation: The calculation determines the number of full weeks that have passed since the first day of the last menstrual period, providing the standard method for estimating gestational age.
Details: Accurate gestational age calculation is crucial for monitoring fetal growth, scheduling prenatal tests, determining due date, and making important clinical decisions throughout pregnancy.
Tips: Enter the current date (or any date you want to calculate from) and the first day of your last menstrual period. Both dates must be valid and the LMP date should be before the current date.
Q1: Why is LMP used instead of conception date?
A: LMP is used because it's typically more reliably known than the exact conception date, and it's the standard method used by healthcare providers worldwide.
Q2: How accurate is this calculation?
A: This calculation provides a good estimate, but ultrasound measurements in early pregnancy are more accurate for confirming gestational age.
Q3: What if I have irregular periods?
A: If you have irregular periods, the LMP method may be less accurate. An early ultrasound is recommended for more precise dating.
Q4: When should I see a healthcare provider?
A: You should schedule your first prenatal appointment as soon as you suspect you're pregnant, typically around 8 weeks gestation.
Q5: Can this calculator predict my due date?
A: Yes, your estimated due date is 40 weeks from your LMP. Add 280 days (40 weeks) to your LMP date to calculate your due date.