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Life & fun · July 20, 2015

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Displaying Lifespan Info in a D3 Family Tree Visualization

Displaying Lifespan Info in a D3 Family Tree Visualization launched on July 20, 2015 with 15 votes, #1,603 of 4,208 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 11 years on.

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In plain words

This tool visualizes family trees using D3, displaying how ancestors span across generations. It shows the theoretical maximum number of ancestors in each generation using a green "ancestor cone" that accounts for population growth over time. The visualization helps users understand genealogical relationships across centuries, assuming an average of 25 years per generation. It's designed for people interested in family history and the mathematics of ancestry.

written from the facts on this page · September 2026

From the sources

You are using an outdated browser. Please upgrade your browser to improve your experience. The width of the green region represents an estimate of the maximum number of ancestors for in each generation back. This region is referred to as the "ancestor cone", based on this note by Wait But Why's Tim Urban. For hundreds of years back in time, the cone appears to be a line here because it is dwarfed by the world population. However, eventually the doubling growth takes over and the number of ancestors begins to be noticeable relative to the world population. In this case, we assume a value of 25 years per generation, and so every 25 years back in time, the number of ancestors at each…from learnforeverlearn.com

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