Leeds Method Clustering Tool
Leeds Method Clustering Tool
Group your autosomal DNA matches into clusters that roughly correspond to your four grandparents' lines, using Dana Leeds' classic technique — entirely in your browser, nothing is uploaded anywhere.
How this works
1. Add your matches with their shared cM. 2. Set a "too close" threshold — matches above it (parents, siblings, etc.) are excluded, since they'll share DNA with everyone and won't help separate lines. 3. For the remaining matches, tick the boxes where two matches appear on each other's shared-match list at your testing company (this is the "in common with" data the method relies on). 4. Click Cluster. The tool works from your highest surviving match down: each match joins every existing color group it shares DNA with; if it shares with none, it starts a new group (up to your chosen maximum, normally four — one per grandparent).
1. Your matches
Add each match's name and total shared cM.
| Name | Shared cM |
|---|
2. Settings
3. Shared-match grid ("in common with")
Tick a box where the row match and column match appear on each other's shared-match list. Only matches at or below your threshold are shown — they're listed largest to smallest.
Results
Rename each color to the grandparent line it turns out to represent once you recognize surnames or known relatives in it.