Fan chart maker
One person in the middle, their parents, grandparents and further forebears in rings around them: from your own tree, or blank to fill in by hand. Free, no sign-up, nothing uploaded.
Ahnentafel numbering: the person in the middle is 1, their father 2 and mother 3, and the father of any number n is 2n and the mother 2n + 1.
Shortened to fit
These names or dates did not fit their segment at the smallest legible size, so the chart shows them cut with …. In full:
This page only reads. It draws the tree that the family tree maker keeps in this browser, or a file you open, and never changes, saves or uploads either. Choosing another person or layout here changes nothing in your tree.
What a fan chart shows
A fan chart is a pedigree drawn as rings: the starting person in the middle, two parents in the first ring, four grandparents in the next, then 8, 16, 32 and 64. Seven generations hold 127 places. Because every place has a fixed spot, gaps show at a glance: an unknown great-grandmother leaves her segment empty, and so does every segment beyond her in that wedge.
Father's side on the left, mother's on the right, in the half circle and the full circle alike. Each segment holds the name and the birth and death dates as typed in your tree, so "1182 LT" or "Year 312 of the Third Age" print as written. By house colours each ancestor in the colour of the house they were born into (or their house, if no birth house is set), so you can follow where each line came from; By side colours the father's and mother's halves, lighter with each generation.
The example is an invented family of the Saltby coast: Wren Ashcombe and 40 forebears across seven generations from eight houses. Isaut Pellin's mother is unknown, so her segment and the two beyond it stay empty; at seven generations most of the outer ring is empty, as in most real and invented trees.
Blank fan chart, numbered
Choose Blank, to fill in by hand for an empty fan with every segment numbered. The numbers are Ahnentafel numbers, the system genealogists use: you are 1, your father 2 and mother 3; the father of any number n is 2n and the mother 2n + 1. So your mother's father is 6, his mother 13. The same numbers are listed under every chart that has to shorten a name.
Where the tree comes from
The tree saved in this browser by the family tree maker or one of its versions (fantasy, royal dynasty, original characters), a .dankstory-tree.json file, or a .ged GEDCOM 5.5.1 file from a genealogy program. A file is read in this browser; a damaged or foreign file is refused with a message.
What it cannot do
It draws ancestors only: there is no descendants fan. It stops at seven generations; for more, start a new fan at an ancestor in the outer ring. Portraits added on the tree pages are not drawn in the segments: the outer rings are a few millimetres wide on paper, so pictures stay on the tree chart. Only the name and dates show; titles, places and notes do not. A person with adoptive or foster parents is drawn with those parents in their place, like the tree does, with no mark that they are not birth parents.
Dankstory trees do not record sex, so to decide who goes on the father's side the page uses, in order, the Counts for succession as field of the royal-dynasty page (Male or Female) or a GEDCOM file's SEX line, then the first partner of the couple. If a couple comes out the wrong way round, open your tree file on the royal dynasty page, set that person's Counts for succession as to Male or Female there and save the file again. When cousins married, a shared ancestor appears in two segments, as on any fan chart.
Names are cut with an ellipsis only when they do not fit at 7 px, and are always listed in full under the chart. On A4 or Letter a seven-generation fan is small at the edge; the SVG keeps every detail at any size, for printing larger at a copy shop.