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cM Explainer
This tool predicts how you might be related to a DNA Match, based on the amount of DNA you share with the match, and self-reported ages (if available).
SegcM | DNA Science
The relationship prediction tools at this site take into account differences between maternal and paternal relationships and show that close genealogical relationships considered to be in the same group are sometimes quite different. Another advantage of this tool is that it works for percentages at 23andMe and for cM values in the range of full-siblings at 23andMe. This tool is the go-to predictor for close family surprises.
Shared cM Tool (Version 4)
The Shared cM Project (ScP) is a collaborative data collection and analysis project created to understand the ranges of shared cM associated with various known relationships. The ScP has been very successful, with more than 60,000 submissions from amazing genealogists like YOU!