The Shared cM Project is a collaborative research project that uses data from 100s of genealogists to generate shared DNA ranges and averages for nearly 50 different genealogical relationships. The most recent version of the Shared cM Project, Version 4.0, was released on March 27, 2020 (I had so much free time in the early days of the pandemic!). See “Version 4.0! March 2020 Update to the Shared cM Project!”
Several years ago, Jonny Perl – creator of the invaluable genealogical website DNAPainter.com – graciously converted the results of the Shared cM Project into a dynamic online tool. With this FREE tool, a genealogist can enter an amount of DNA shared (in cM) with a match at a testing company, and the possible relationships for that shared amount will highlight in the graphic. In addition, clicking on any of the relationship boxes produces a pop-up that reveals the histogram for that relationship (arguably the most valuable aspect of the Shared cM Project).