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Conception Date Calculator

Estimate your conception date

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator estimates your conception date by working backward from your estimated due date, subtracting 266 days (38 weeks) — the average length of pregnancy counted from conception rather than from the last menstrual period. It also estimates the likely implantation window, typically 6 to 10 days after conception.

Expectant parents use it out of curiosity or to help pin down an approximate conception timeline, and it's sometimes used alongside other dating methods to cross-check an estimated due date. Enter your due date to see the estimated conception date, implantation window, and day of the week.

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