Pregnancy Due Date Calculator

Congratulations to the New Mom and Dad To Be.

Fortis Nest wishes you a healthy and happy Pregnancy Journey.

Use the Nest Due Date Calculator to find out when your baby is due. later, your Gynaecologist will confirm the baby's gestational age with a first trimester ultrasound.

Free Pregnancy Calculator | Due Date, Conception Date Calculation

Pregnancy Due Date Calculator

Due Date, Conception Date Calculation Results:


Pregnancy Due Date Calculator Guide - The 3 Simple Steps

  1. Enter the date of the first day of your last period
  2. Enter the month & year
  3. Then hit Calculate

The expected date of delivery (EDD) is calculated by adding one year, subtracting three months, and adding seven days to the first day of a woman's last menstrual period (LMP). The result is approximately 280 days (40 weeks).

Example: LMP =  20 August 2017

+ 1 year = 20 August 2018

- 3 months = 20 May 2018

+ 7 days = 27 May 2018


Please Note : The calculation method above does not always result in a 280 days because not all calendar months are the same length, nor does it account for leap years.


Childbirth usually occurs about 38 weeks after conception, or about 40 weeks after the last menstrual period. The actual length of pregnancy depends on various factors, for example:

  • The first pregnancy tends to last longer than subsequent pregnancies.
  • Fewer than 10% of births occur on the due date.
  • 50% of births occur within a week of the due date, and almost 90% occur within two weeks of the due date.
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