Enter the centimorgans (cM) you share with a match on Ancestry, MyHeritage, 23andMe, FamilyTreeDNA or GEDmatch. See every relationship that fits, and how well.
Each figure is the average and the observed range (min to max) of total shared cM, from tens of thousands of submitted relationships.
Ranges from The Shared cM Project v4 (March 2020) by Blaine T. Bettinger, CC BY 4.0. For relationships more distant than half second cousins the project sets the minimum to 0 cM.
A centimorgan is a unit of genetic length. DNA testing sites add up the length of every segment you and a match have in common, and that total shared cM is the best single clue to how you are related.
Relatives with the same expected amount of shared DNA overlap completely. A half sibling, a grandparent and an aunt all share about 1,750 cM on average, so the number alone cannot tell them apart. Ages, the match's own family tree and shared matches settle it.
No. The calculator shows which relationships have been observed at your number, and how central it is in each range. Real probabilities also depend on how many relatives of each kind you have, and everyone has far more distant cousins than close ones.
The Shared cM Project, Version 4 (March 2020), by genetic genealogist Blaine T. Bettinger, built from about 60,000 relationships submitted by people who knew how they were related. It is licensed CC BY 4.0.
Yes. When families have married within the same community for generations (common in many South Asian, Jewish and island populations), people share extra DNA through many lines at once. Expect matches to look closer than they really are.
The calculation runs in your browser. The number you enter may be logged to help us improve the tool, but it is never shown publicly. Saved matches stay in your own browser unless you email them to yourself.