Genealogy & Family
Ahnentafel number
Father, mother and generation of an Ahnentafel number.
- Instant
- Free
- Private (processed locally)
- No sign-up
Explore an Ahnentafel number
Enter an Ahnentafel number: the tool shows the generation, the father, mother and child numbers.
Example
| Input | Value |
|---|---|
| Number | 5 |
| Father (2n) | 10 |
| Mother (2n+1) | 11 |
| Child (n/2) | 2 |
| Generation | 3 |
100% local calculation.
Frequently asked questions
How does Ahnentafel numbering work?
The reference person is no. 1; the father of individual n is 2n, the mother 2n+1.
Men and women?
Men always have an even number, women an odd number, except no. 1.
What is the generation for?
It shows the ancestry rank: 1 = self, 2 = parents, 3 = grandparents, etc.