Estimated Date of Delivery Calculator

Calculate the estimated delivery date for pregnancy using last menstrual period, IVF transfer date, or ultrasound measurements.

Patient Information

Enter your information to calculate the estimated delivery date

Naegele's Rule (LMP)

Adds 280 days to the first day of the last menstrual period. Most commonly used for regular cycles.

IVF Calculation

Precise calculation based on embryo transfer date and embryo age. Most accurate for assisted reproduction.

Ultrasound Dating

Uses gestational age measured during ultrasound. Most accurate in first trimester.

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Last Menstrual Period (Naegele's Rule)

Standard formula for calculating EDD:

EDD = LMP + 280 days (40 weeks)

IVF Transfer

Based on 266 days from fertilization (per Wikipedia):

Day 3 embryo: EDD = Transfer date + 263 days (266 - 3)
Day 5 embryo: EDD = Transfer date + 261 days (266 - 5)

Ultrasound

Using measured gestational age:

EDD = Ultrasound date + (280 - gestational_age_in_days)

Medical Reference

Wikipedia Reference

This calculator implements Naegele's Rule, IVF calculation methods, and ultrasound dating as described in the Wikipedia article on Estimated Date of Delivery.

View Wikipedia Article
Author

Dr. Beltrán J.F.