23andMe, Ancestry, DNA Testing, FTDNA, GEDMatch, MyHeritage

How do I find the shared centiMorgans?

Finding how many centiMorgans (cMs) you share with a DNA match lets you get a better understanding of the ways in which the two of you may be related.

The information sheet on How much DNA do we share?  described ways of finding the many possible relationships based on a given amount of shared cMs.  Today’s information sheet looks at how you go about finding the number of cMs you share with your matches on the main testing/comparison sites – Ancestry, Family Tree DNA, 23andMe, MyHeritage and GEDMatch.

How do I find the shared centiMorgans?

Click here to see all the information sheets currently available.

Finding the cMs on Ancestry is a popular question – this graphic provides a quick overview:

DNA Testing, Genetic Genealogy

Understanding Relationships (Part Two) – how much DNA do we share?

Being able to identify possible relationships by examining how much DNA is shared between two people is a key part of genetic genealogy.

Today’s information sheet looks at the categories used by the testing companies and how to move beyond these headings to find the correct relationship between you and your matches.

It provides an non-technical overview of

  • how DNA is measured
  • how it passes from one generation to the next,
  • why you might not share any DNA with people who are your relatives (and why your sibling/cousin matches someone you don’t)
    and
  • how much DNA you can expect to share for a variety of different relationships.

Links to online charts/calculators are provided, helping you get a headstart on working with your own matches when your DNA results arrive.

Understanding Relationships (Part Two) – How much DNA do we share?

Click here to see all the information sheets currently available.