Step 1
Start with the subject
Enter the main person as number 1. This can be you, a client, or any ancestor you are researching.
Free genealogy tool
Free Ahnentafel Chart Generator
An ahnentafel chart generator creates a numbered list of direct ancestors where person 1 is the subject, every father is double the child's number, and every mother is double plus one. Use it to build a compact genealogy numbering chart for research notes, reports, and family history books.
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Ancestor entries
Fill the first four generations. Leave unknown ancestors blank to keep their numbers as research placeholders.
3 of 15 named
1
Subject
Generation 1
2
Father
Generation 2
3
Mother
Generation 2
4
Father's father
Generation 3
5
Father's mother
Generation 3
6
Mother's father
Generation 3
7
Mother's mother
Generation 3
8
Father's paternal grandfather
Generation 4
9
Father's paternal grandmother
Generation 4
10
Father's maternal grandfather
Generation 4
11
Father's maternal grandmother
Generation 4
12
Mother's paternal grandfather
Generation 4
13
Mother's paternal grandmother
Generation 4
14
Mother's maternal grandfather
Generation 4
15
Mother's maternal grandmother
Generation 4
How to use this ahnentafel chart
Step 2
Fill direct parents
Add father and mother entries as numbers 2 and 3, then keep moving backward one generation at a time.
Step 3
Add dates and places
Record birth and death years, key locations, and short notes so each numbered ancestor has context.
Step 4
Copy the chart
Copy the markdown chart for notes or the CSV version for spreadsheets and genealogy research logs.
Ahnentafel chart FAQ
What is an ahnentafel chart?
An ahnentafel chart is an ancestor list that assigns every person a number. The subject is 1, the father is 2, the mother is 3, and each person's parents are double and double-plus-one.
How do ahnentafel numbers work?
For any person numbered n, their father is 2n and their mother is 2n + 1. That rule makes it easy to identify direct-line ancestors without drawing a large tree.
When should I use an ahnentafel chart?
Use an ahnentafel chart when you need a compact ancestor reference for research notes, a family history book, a research report, or a printed worksheet.
Can I leave unknown ancestors blank?
Yes. Blank entries are useful placeholders. Keeping the ahnentafel number visible makes it clear which direct-line ancestor is still unknown.
Can this replace a full family tree?
No. Ahnentafel charts are best for direct ancestors. Use a full family tree when you need siblings, spouses, descendants, or collateral relatives.
Related genealogy tools
Turn numbered ancestor lists into sourced family history.
Family Tree Template Generator
Print a visual family tree worksheet after your ahnentafel list is organized.
Free Genealogy Research Log Generator
Track the searches and sources behind each numbered ancestor.
Free Genealogy Citation Generator
Create source citations for records that prove names, dates, and relationships.
Family Relationship Chart
Map cousin and extended family relationships once direct ancestors are known.