Ancestor Count Calculator
Calculate the theoretical and adjusted number of ancestors across generations, accounting for pedigree collapse.
Inputs
Results
Theoretical Ancestors
2,046
Adjusted (w/ Collapse)
1,724
Unknown Ancestors1,704
Tree Completeness1.2%
Collapse Significance Gen20
How to Use This Calculator
- Enter the number of Generations Back you want to project (e.g., 5 generations = great-great-grandparents).
- Enter the Pedigree Collapse Rate percentage to account for cousins marrying in earlier populations.
- Enter the number of Known Ancestors in your current tree.
- Review Theoretical vs Adjusted Ancestor Count to understand how pedigree collapse reduces the true number.
- Check Tree Completeness percentage and Unknown Ancestors to prioritize your research gaps.
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