AncestryDNA Match Types Guide: Understanding Shared DNA & Genetic Relationships

AncestryDNA matches show how closely you are related to other users based on shared DNA segments. Understanding match types helps you confirm family relationships, identify new relatives, and build a more accurate family tree. This guide is hand-verified to ensure accuracy for 2026. For current savings on DNA kits, visit our Ancestry Savings Center.

What DNA Matches Represent

DNA matches show how much DNA you share with another person. The amount is measured in centimorgans (cM), which indicate the strength of the genetic relationship. Higher cM values mean closer relationships, while lower values indicate distant or speculative connections.

• Shared Centimorgans (cM): Total amount of DNA shared.
• Segments: Number of DNA segments shared.
• Predicted Relationship: Ancestry’s estimate based on cM ranges.

Close Family Matches

Close family matches share large amounts of DNA and represent immediate relatives. These matches are highly reliable and easy to confirm.

• Parent/Child: ~3,400 cM
• Full Sibling: ~2,500 cM
• Half Sibling: ~1,700 cM
• Grandparent/Grandchild: ~1,700 cM
• Aunt/Uncle or Niece/Nephew: ~1,700 cM

Extended Family Matches

Extended family matches represent relatives within two to four generations. These matches are extremely helpful for building out your tree.

• First Cousin: ~850 cM
• First Cousin Once Removed: ~425 cM
• Second Cousin: ~200 cM
• Third Cousin: ~75 cM

Distant Matches

Distant matches share small amounts of DNA and may represent relatives five or more generations back. These matches can be useful but require careful evaluation.

• Fourth Cousin: ~35 cM
• Fifth Cousin: ~20 cM
• Speculative Matches: <20 cM

How to Use DNA Matches in Your Tree

DNA matches become more powerful when linked to your family tree. Ancestry’s tools help you identify shared ancestors, confirm relationships, and discover new branches.

• Shared Matches: Identify relatives who match both you and another person.
• Common Ancestors: Ancestry highlights ancestors shared between trees.
• ThruLines: Suggests potential relationships based on DNA and tree data.

Common Issues When Interpreting DNA Matches

• Low cM Matches: May be false positives or extremely distant relatives.
• Endogamy: Populations with intermarriage may show inflated cM values.
• Incomplete Trees: Missing ancestors can limit ThruLines accuracy.

Is DNA Matching Enough on Its Own?

DNA matching is a powerful tool, but it works best when combined with historical records and a well-built family tree. Use matches as clues, not definitive proof, and verify relationships with documents whenever possible.

Explore Ancestry Resource Hub

• View All Ancestry Deals & Coupons
• AncestryDNA Traits Guide
• Family Tree Building Guide
• AncestryDNA Savings Guide

Editor’s Note: This guide is maintained by the Daily Bargains research team. We verify all DNA match ranges and update this page regularly to ensure accuracy for your genealogy research.