How accurate is the due date?

Only about 5% of babies are born on the exact EDD (Expected Date of Delivery) given to them. This date is an estimate based on an average 40 week pregnancy. The most accurate way to determine the date is the ultrasound scan done at 12 weeks.

How to calculate the due date of the baby?

According to Naegele's rule: Counting back 3 months from the date of the last menstrual period (LMP), adding 7 days and a year. Or: LMP + 280 days.

Maternale sûnens

Baby's due date (EDD)

Berekkenje de ferfaldatum basearre op de lêste menstruaasje

Medically Reviewed:

Dr. Priya Sammani, MBBS, PG Dip. FM

Updated on: April 2026

❓ Frequently Asked Questions (FAQ)

Hoe akkuraat is de deadline?

Allinich sawat 5% fan 'e poppen wurde berne op' e krekte EDD (ferwachte leveringsdatum) dy't har jûn is. Dizze datum is in skatting basearre op in gemiddelde 40 wiken fan swangerskip. De meast krekte manier om de datum te bepalen is de echografie dien op 12 wiken.

Hoe te berekkenjen de ferfaldatum fan de poppe?

Neffens Naegele's regel: 3 moannen werom telle fan 'e datum fan' e lêste menstruaasje (LMP), tafoegje 7 dagen en in jier. Of: LMP + 280 dagen.

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Medical Disclaimer: These calculators are provided for educational purposes only and are not a substitute for professional medical advice. Always consult a qualified physician regarding any health concerns..