You can now get relationship predictions from the # of segments and total cMs. It works much better than expected. The data come from a peer-reviewed source. Other predictors use simulated data from 2016 or earlier.
DOUBLE cousin PREDICTOR
This tool is similar to the above relationship predictor except that it includes 3/4 siblings, double 1st cousins, and many other double cousin relationships. You can’t find these in any other relationship predictors.
After using the GEDmatch “Are Your Parents Related?” tool, the best thing to do next is to enter the cM amount directly into this tool.
How much of an ancestor’s DNA do you have? How much would you be able to reproduce if you and various relatives all had your DNA tested?
This is the same as the regular relationship predictor except this one doesn’t have population weights applied to the data. It’s good for checking matches when you already think you know the relationship.