Free genealogy calculator
How many ancestors are in each generation?
Choose a generation to see the theoretical number of direct ancestors, the cumulative research slots, and an estimated birth period.
These are pedigree positions, not necessarily unique people. Pedigree collapse can make one person occupy more than one position.
Turn the number into a research plan
1
The number doubles in a complete theoretical tree: 2 parents, 4 grandparents, 8 great-grandparents, and so on.
2
The cumulative total adds every generation between you and the selected level. It measures research positions, not verified individuals.
3
The year is only a planning estimate. Actual parent-child intervals vary widely across families.