Due Date Calculator

This calculator will calculate conception date based on the average menstruation cylce that you enter below. The calculation is made using a 266 day method.


Step 1. Enter the date of the first day of the last menstruation period:



Step 2. Enter the average time in days between menstruation cycles:

Number of Days:

Step 3.  

The calculation results are shown in the fields below:


  Approximate Conception Date (+/- 2 days)
  Estimated Due Date


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