The Conception Calculator

Due on New Year's 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 New Year's Day (January 1) was most likely conceived around April 10 of the previous year.

Due dateJanuary 1
Most likely conception dateApril 10
Likely conception windowApril 7 – April 13
Estimated last periodMarch 27

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.

Open the calculator

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