For a multiple cousin relationship predictor, click here. For relationship probabilities weighted by proportion in the population, click here. You would want to use the weighted predictor if you have no idea who your match is. You would want to stay on the current page if you believe you know how your match fits into your family tree and you're checking to confirm that. Population weights give a significant advantage to more distant cousins because a person likely has about 5x as many cousins...| DNA Science
The "Ancestry" input box can be used for Ancestry, FTDNA, and MyHeritage. The methods used at 23andMe are different in that total IBD sharing is used rather than HIR and some segments as low as 5 cMs are included. GEDmatch predictions can be obtained by using the 23andMe cMs box and checking for "HIR."| DNA Science