The Conception Calculator

Due on Canada Day: When Did You Conceive?

Due dates & conception. Updated . Calculated with the standard pregnancy dating method used by ACOG and the NHS.

A baby due on Canada Day (July 1) was most likely conceived around October 8 of the previous year.

Due dateJuly 1
Most likely conception dateOctober 8
Likely conception windowOctober 5 – October 11
Estimated last periodSeptember 24

Only a small share of babies arrive on their exact due date, so a holiday due date is a target rather than a promise.

Use the conception date calculator for your exact dates.

Conception Date Calculator: Find the most likely conception date from your due date.

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This article is general information, not medical advice. Talk to a doctor or midwife about your own pregnancy or fertility.