health pregnancy

Pregnancy Due Date Calculator (By LMP, Ultrasound, or Conception)

Clinical due date calculator determining estimated delivery date (EDD) via Naegele's rule, 1st/2nd trimester ultrasound sonogram, or conception date.

Input Parameters

Due Date Calculation Method

Calendar Reference Date

Gestational Weeks at Ultrasound (only for USG method) (semanas)

Average Menstrual Cycle Length (for LMP method) (días)

Instant Calculation Result

Estimated Output

Active in Real-Time

Adjust values on the left to calculate live results.

Formula: ACOG Criteria: 1. LMP = LMP Date + 280 days. 2. USG = Scan Date + (280 - ScanWeeks × 7). 3. Conception = Conception Date + 266 days.

In-Depth Guide & Mathematical Methodology

📅 ACOG Due Date Determination Rules

1st Trimester USG: Replaces LMP date if discrepancy is > 5 days (up to 8+6 weeks) or > 7 days (9 to 13+6 weeks).

2nd Trimester USG: Replaces LMP date if discrepancy is > 7 to 10 days (14 to 21+6 weeks).

Frequently Asked Questions (FAQ)

What is the Pregnancy Due Date Calculator (By LMP, Ultrasound, or Conception) and how does it work?

Clinical due date calculator determining estimated delivery date (EDD) via Naegele's rule, 1st/2nd trimester ultrasound sonogram, or conception date.

How do I use this Pregnancy Due Date Calculator (By LMP, Ultrasound, or Conception)?

Select calculation method (Last Period LMP, Ultrasound USG scan, or Conception Date). Select reference date on calendar. If ultrasound selected, enter weeks and days stated on sonogram report. View estimated delivery due date (EDD) and countdown days.

What mathematical formula is used in this calculation?

ACOG Criteria: 1. LMP = LMP Date + 280 days. 2. USG = Scan Date + (280 - ScanWeeks × 7). 3. Conception = Conception Date + 266 days.

Is the Pregnancy Due Date Calculator (By LMP, Ultrasound, or Conception) 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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