Given two tests that share some cM of autosomal DNA, how can I easily find the predicted relationships that such shared cM would suggest?

For example, a 2,200 cM match suggests it could be either: grandparent, half-sibling, or grandchild.

1 Answer 1


The Shared cM Project 4.0 tool v4 from DNA Painter project mentioned in this blog post makes it simple.

To jump straight to the relationships a 2,200 cM match may suggest just append the number at the end of that URL: https://dnapainter.com/tools/sharedcmv4/2200

It computes using the information in this chart from the August 2017 updated to the Shared cM project:

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