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The Shared cM Project 4.0 tool v4

Read more about the tool and this update

March 2020

Blaine T. Bettinger

www.thegeneticgenealogist.com

More about this project

CC 4.0 Attribution License

Interactive version v4 by Jonny Perl at DNA Painter

Click here to contribute data to the shared cM project

Last updated 26th March 2020

Important

• For relationships more distant than Half 2C, the averages were determined only for relationships in which DNA was shared.

• The more distant a relationship, the more likely it is that you won't share DNA at all (read more)

• These statistics do not cater for pedigree collapse or endogamy

Filter

reset or enter %
Click here for a shareable link to the cM amount above

It's still possible that you are related to a match with whom you share no detectable DNA...

Most distant common ancestors

Assuming no pedigree collapse or endogamy, and that you're related in just one way, the furthest back you might need to go to find common ancestors for a match of cM is

A match of cM has a wide range of possible relationships. The connection may be within 8th-Great-Grandparent level, but the common ancestors could also be 20 or more generations back.

Relationship probabilities (based on stats from The DNA Geek)

New: View these relationships in a tree

  • Enter a number above to see probabilities

New Click on any relationship to view a histogram

Read more about cousin relationships

How to read this chart

  • RelationshipAverageRange
    (low to high;
    99th percentile)
  • Great-Great-Great-Grandparent
  • GGGG Aunt / Uncle
  • Great-Great-Grandparent
  • GGG Aunt / Uncle
  • Half GG-Aunt / Uncle208103 – 284
  • Great-Grandparent887485 – 1486
  • Great-Great-Aunt / Uncle420186 – 713
  • 1C3R11725 – 238
  • 2C3R510 – 154
  • Other Relationships
  • Half 1C2R12516 – 269
  • Half Great-Aunt / Uncle431184 – 668
  • Grandparent1754984 – 2462
  • Great-Aunt / Uncle850330 – 1467
  • 1C2R22133 – 471
  • 2C2R710 – 244
  • 3C2R360 – 166
  • 6C180 – 71
  • Half 2C1R660 – 190
  • Half 1C1R22462 – 469
  • Half Aunt / Uncle871492 – 1315
  • Parent34852376 – 3720
  • Aunt / Uncle17411201 – 2282
  • 1C1R433102 – 980
  • 2C1R12214 – 353
  • 3C1R480 – 192
  • 4C1R280 – 126
  • 6C1R150 – 56
  • Half 3C480 – 168
  • Half 2C12010 – 325
  • Half 1C449156 – 979
  • Half Sibling17591160 – 2436
  • Sibling26131613 – 3488
  • SELF
  • 1C866396 – 1397
  • 2C22941 – 592
  • 3C730 – 234
  • 4C350 – 139
  • 5C250 – 117
  • 6C2R130 – 45
  • Half 3C1R370 – 139
  • Half 2C1R660 – 190
  • Half 1C1R22462 – 469
  • Half Niece / Nephew871492 – 1315
  • Niece / Nephew17401201 – 2282
  • Child34872376 – 3720
  • 1C1R433102 – 980
  • 2C1R12214 – 353
  • 3C1R480 – 192
  • 4C1R280 – 126
  • 5C1R210 – 80
  • 7C140 – 57
  • Half 3C2R270 – 78
  • Half 2C2R480 – 144
  • Half 1C2R12516 – 269
  • Half Great-Niece / Nephew431184 – 668
  • Great-Niece / Nephew850330 – 1467
  • Grandchild1754984 – 2462
  • 1C2R22133 – 471
  • 2C2R710 – 244
  • 3C2R360 – 166
  • 4C2R220 – 93
  • 5C2R180 – 65
  • 7C1R120 – 50
  • Half 3C3R
  • Half 2C3R
  • Half 1C3R600 – 120
  • Half GG-Niece / Nephew208103 – 284
  • Great-Great-Niece / Nephew420186 – 713
  • Great-Grandchild887485 – 1486
  • 1C3R11725 – 238
  • 2C3R510 – 154
  • 3C3R270 – 98
  • 4C3R190 – 60
  • 5C3R130 – 30
  • 8C110 – 42