health pregnancy

Pregnancy & Gestational Age Calculator (By LMP Date)

Clinical obstetric calculator using cycle-adjusted Naegele's Rule. Calculates exact estimated delivery due date (EDD), current gestational age today, and estimated conception window.

Input Parameters

First Day of Last Menstrual Period (LMP)

Average Menstrual Cycle Length (días)

Instant Calculation Result

Estimated Output

Active in Real-Time

Adjust values on the left to calculate live results.

Formula: Adjusted Naegele's Rule: EDD = LMP + 280 days + (CycleLength - 28). Gestational Age = Days between LMP and current date.

In-Depth Guide & Mathematical Methodology

👶 Clinical Trimester Milestones

First Trimester (Weeks 1-13): Embryonic organogenesis. Fetal heartbeat detectable by ultrasound around week 6.

Second Trimester (Weeks 14-27): Fetal movement felt around weeks 18-20 (quickening).

Third Trimester (Weeks 28-40): Lung maturation and weight gain prior to delivery.

Frequently Asked Questions (FAQ)

What is the Pregnancy & Gestational Age Calculator (By LMP Date) and how does it work?

Clinical obstetric calculator using cycle-adjusted Naegele's Rule. Calculates exact estimated delivery due date (EDD), current gestational age today, and estimated conception window.

How do I use this Pregnancy & Gestational Age Calculator (By LMP Date)?

Select the first day of your Last Menstrual Period (LMP). Enter average menstrual cycle length (default 28 days). View exact gestational age in weeks and days as of today. View calculated estimated delivery due date (EDD) and remaining days.

What mathematical formula is used in this calculation?

Adjusted Naegele's Rule: EDD = LMP + 280 days + (CycleLength - 28). Gestational Age = Days between LMP and current date.

Is the Pregnancy & Gestational Age Calculator (By LMP Date) on FindCalculator free to use?

Yes, all 330+ interactive tools on FindCalculator.online are 100% free, run directly in your browser without registration, and do not store your private calculation data.

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