Pregnancy & Women's HealthNaegele's Rule (LMP + 280 Days)

Due Date Calculator

Accurately predicts your baby's estimated delivery date using Naegele's Rule, exact conception date, or IVF 3-day/5-day embryo transfer.

Pregnancy & Women's Health• Naegele's Rule (LMP + 280 Days)

Due Date Calculator

Calculate estimated date of delivery (EDD) based on LMP, conception, or IVF date.

First Day of Last Period (LMP)

Gestational Age: 10 weeks, 0 daysTrimester 1

W1T2 (W14)T3 (W28)Due (W40)

Due DateMay 26, 2027

ConceptionSeptember 2, 2026

Countdown209 days

Evidence-based estimations. Consult a physician for personalized guidance.

Clinical Formula & Calculation Standard

Official clinical definitions and validated mathematical models

Naegele's Rule & Embryo Transfer Dating

LMP Method: EDD = LMP + 280 days + (Cycle Length - 28) IVF Day 3 Transfer: EDD = Transfer Date + 263 days IVF Day 5 / Blastocyst: EDD = Transfer Date + 261 days

Computes expected delivery date across standard menstrual dating, ultrasound biometric crown-rump length (CRL), and assisted reproductive transfers.

Clinical Insights & Practical Usage

Crown-rump length on first trimester ultrasound (8–13 weeks) is considered the most accurate clinical dating method.

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