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Shared Centimorgans on Ancestry: How to Access?

Have you seen people mentioning “shared centimorgans” or seen someone say “shared cMs” and wonder how on earth they accessed that information on their Ancestry DNA results?  You are not alone.  I am embarrassed to say that I had been using the site for more than a year before I figure it out.   Actually, it might have even been longer than that!  In this post, I’ll show you show you how to access shared centimorgans on Ancestry.

How to find shared centimorgans on ancestry

How to Find Shared Centimorgans on Ancestry DNA

  1. Click on your list of DNA matches, which should bring up the page will all of your matches listed.
  2. Click on the green “VIEW MATCH” button, which will bring up the individual match page.
  3. Lastly, click on the little grey “i” under the predicted relationship.
  4. A little box should pop up that tells you the amount of cMs that you share with your match.

The image above should help you if you are having trouble spotting where to click.

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Why is the Amount of Shared DNA Important?

I am so glad that you asked.  The reason that it’s good to know how much DNA you share with someone is that this information can help you figure out exactly how you are related.  There are ranges for the average amount of DNA that people of different relationships share with each other, and so if you know the shared cMs, you can figure out how you are, and how you are not, related.

Once you know the amount of shared DNA, you can take a peek at their tree, if they have one, and you will know how far back in their tree (and your tree) you need to look for your common ancestor.

Sometimes, people are surprised by the amount of DNA that they share with their matches.  I know that I definitely was surprised by the things that I learned about my own family.

If you want to know more about shared centimorgans, you might be interested in this post: “Beginner’s Guide to Shared Centimorgans”


I have learned so much from this little trick, and it has been extremely handy for family tree research.  If you have already done your DNA test and have a question about shared DNA, I would love to hear from you in the comments!

Thank you for stopping by, it is much appreciated 🙂

Share the knowledge!

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Yvon Chateauneuf

Sunday 7th of February 2021

I had my DNA done in 2018, but I have no information on my biological parents. My adoption was done illegally, no papers, wrong date of birth, no location as to where I was born, absolutely nothing. I have 69,000 matches, my highest has 386 cM, over 16 segment. this person has very little to share as tree. I am wondering if Ancestry can be of any help for my case. What do you think?

Stephen Johnson

Thursday 25th of June 2020

I got a big surprise recently when I found a name I had not seen before that appears to be a close first cousin. We share 1809 cM over 63 segments. Unfortunately this person does not have a family tree. I've written him through Ancestry and have not received a reply. My guess is he would have been fathered or mothered by one of my Aunts or Uncles or possibly my father. I've never ran across his surname in any of my family tree researches. We have close to 11,000 names in our family tree.

Simone Freeman

Thursday 16th of April 2020

Hi my name is Simone I have one dna match that ancestry said is my first cousin but I think he’s my half nephew only because we share 841 centimorgans across 46 segments is he my half nephew


Tuesday 21st of April 2020

Hi Simone, Thank you so much for your comment! If you look at the calculator here: you will notice that there is a chance that this match could be a first cousin OR a half-nephew, among other possibilities. The best thing to do is use other information (like age, place of birth, family tree info) in order to figure out exactly where this match belongs on your family tree. I hope that this helps you :) Mercedes


Friday 28th of February 2020

I share 2,224 cm across 66 DNA segments could this be my sibling ? what is segments ? Thank you .


Wednesday 13th of December 2017

I have a brother that is 6 years younger than I am. We only share 1375 centimorgans with 61 DNA segments. This puts him in the half sibling category. I am shocked by this. Does this mean he is not possibly a full sibling and we do not share the same father ? Can the age spread have something to do with this?


Thursday 14th of December 2017

Hi Keztar, I am really sorry to hear that your DNA results have possibly shown you something unexpected - I can absolutely understand your surprise. The typical range for DNA shared between full siblings is 2300-3900 centimorgans, you are correct. Did you do the test with Ancestry DNA? Do the rest of your DNA matches fall in line with what you were expecting to see?

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