Conception Date Calculator: Determine Your Due Date

To calculate when you conceived, subtract 40 weeks (or 280 days) from your due date. Using the given due date of June 3, the calculation would be:

June 3 - 40 weeks = September 16

Subtracting 280 days would also lead to the same result:

June 3 - 280 days = September 16

Therefore, conception likely occurred around September 16 of the previous year.