Pregnancy Calculator


Use this fantastic pregnancy calculator to:
  • Determine your estimated due date.
  • Calculate the likely date of conception.
  • Calculate the end of your first and second trimesters.
  • Find out when important tests may be carried out.
  • Determine important pregnancy milestones.
How to use the Pregnancy Calculator
Enter the date of your last menstrual period and the number of days in your usual menstrual cycle, into the pregnancy calculator.

On average, there are 28 days in a menstrual cycle, but it can last from as little as 22, to as many as 44 days. The pregnancy calculator takes your menstrual cycle into account when calculating the due date and conception date.


Remember that less than 5% of women actually give birth on their due date.

 

 

 

 

Enter first day of your last menstrual period:

Enter length of your cycle (in days):

Weeks of Pregnancy

Estimated Date

Event

2 Weeks (0 dpo)

Ovulation/Fertilization Date

4 Weeks (14 dpo)

Home Pregnancy tests often positive

6-7 Weeks

Fetus and fetal heart usually visible on transvaginal ultrasound

9 Weeks

Major fetal organs have all formed

11-13 Weeks

U/S screen for Down syndrome (nuchal thickening) if indicated

13 Weeks 2 Days

First Trimester ends

15-20 Weeks

MSAFP testing may be suggested

18-20 Weeks

Optimal time to do anatomical ultrasound

20-22 Weeks

You may feel the fetus moving now (Quickening)

23-24 Weeks

Fetal viability begins

26 Weeks 4 days

Second Trimester ends

26-28 Weeks

Glucose Challenge Test (GCT) for diabetes

28 Weeks

Over 90% neonatal survival

32 Weeks

Consider ultrasound to check fetal growth

37 Weeks

Term of pregnancy begins
GBS testing between 35-37 weeks

40 Weeks
(266 dpo)

YOUR DUE DATE

41 Weeks

Consider Fetal Evaluation

42 Weeks

Postdate begins

 
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