Family Tree Completeness Calculator

A family tree grows exponentially: 2 parents, 4 grandparents, 8 great-grandparents, and so on, doubling with every generation back -- which is exactly why genealogy research gets harder the further back you go, and why a simple ancestor count doesn't tell you how complete your research really is. This calculator tracks completeness per generation against that doubling ceiling: Generation 1 (parents) tops out at 2 people, Generation 2 (grandparents) at 4, Generation 3 (great-grandparents) at 8, Generation 4 (2x great-grandparents) at 16, and Generation 5 (3x great-grandparents) at 32, for 62 possible ancestors across all five generations combined. Each generation's completeness percentage is simply the number you've identified divided by that generation's own maximum, so identifying all 8 great-grandparents scores 100% for Generation 3 regardless of how complete Generation 4 or 5 are -- the generations are scored entirely independently of each other.

Overall Completeness sums every generation's known count against the combined total of 62 possible ancestors, which means a single confirmed identity in a deep generation counts for proportionally less toward the overall score than one in an earlier generation, simply because there are so many more slots to fill the further back you go. That's a realistic reflection of the research challenge: most genealogists have their parents and grandparents fully documented but only fragments of their 3x great-grandparents, since older generations mean more names, more lost records, and more research per additional confirmed identity. Entering a number above a generation's maximum has no additional effect -- the calculator caps each generation's contribution at its own ceiling, since a generation genuinely cannot have more ancestors than its doubling formula allows.