Estimated Date of Birth Calculator

Calculate an estimated date of birth, estimated LMP, or current gestational age using common pregnancy dating methods.

Educational Use Only:

This calculator is intended for educational reference only. Pregnancy dating should be confirmed using clinical judgment, local policy, and appropriate provider assessment.

Calculate EDB from LMP

Uses Naegele’s rule: LMP + 280 days.

Defaults to today’s date.

Important:

Results are estimates. This tool does not adjust for cycle length, assisted reproduction dating, early ultrasound dating, or clinical redating rules.

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