# Determining likely relationship based upon autosomal DNA shared cM

## How many shared centimorgans is significant?

For example, you’ll usually share about 120 centimorgans with a 3rd cousin, but it’s possible to share as few as 90 or as many as 200.
What does the match confidence score mean?

Approximate amount of shared DNA (in centimorgans) Possible relationship
200—620 2nd cousin
90—180 3rd cousin
20—85 4th cousin
6—20 Distant cousin: 5th cousin — 8th cousins

## What is a good cM DNA match?

Centimorgans (cM) are units of genetic linkage between two given individuals. For example, if you share 1800 cM with an individual, that means you share around 25% of your DNA with them. A strong match will have around 200 cM or more.

## What does shared DNA cM mean?

When you’re looking at DNA comparisons, the “shared cM” is the total length of the DNA you share with a person. The “shared segments” are how many blocks that matching DNA is broken into.

## How many cM of DNA do cousins share?

Note that a given relationship, such as first cousins, can share varying amounts of DNA because of recombination (“shuffling” that occurs at conception). You usually share about 850 cM with a first cousin, but that number could be as low as 553 or as high as 1,225 cM.

## What does 23% shared DNA mean?

This means you share 23 pieces of DNA with mom, and 23 pieces of DNA with dad. In other words, you share 23 segments of DNA with each parent. Each of these segments is really long – an entire chromosome! Our parents also get half their DNA from their mom and half from their dad.

## How many centimorgans of DNA do first cousins share?

First cousins share an average of 12.5% of their DNA; or 866 centimorgans. The expected range of shared centimorgans is 396-1397, according to the shared centimorgan project.

## What is a high percentage of shared DNA?

Average Percent DNA Shared Between Relatives

Relationship Average % DNA Shared
Full Sibling 50%
Grandparent / Grandchild Aunt / Uncle Niece / Nephew Half Sibling 25%
1st Cousin Great-grandparent Great-grandchild Great-Uncle / Aunt Great Nephew / Niece 12.5%
1st Cousin once removed Half first cousin 6.25%

## Can siblings share more than 50% DNA?

Can siblings share more than 50% of their DNA? Yes, siblings can theoretically share more than 50% of their DNA. This is not very common, however.

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