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`nA = 2^ "n" `

Enter a value for all fields

The **How Many Ancestors** calculator computes the total number of ancestors a person or sexual reproducing animal has base on the number of generations going back. It also estimates the approximate time span associated with those ancestors.

**INSTRUCTIONS**: Enter the following:

- (
**n**) Number of Generations Back - (
**gT**) Time between Generations

**Number of Ancestors (aN):** The calculator returns the number of ancestors and the approximate time span (tS) in years. However, this can be automatically converted to compatible units via the pull-down menu.

Every mammal has two biological parents. Every generation increases the total number of ancestors by a factor of 2. Therefore, the total number of ancestors is equal to:

nA = 2^{n}

where:

- nA = number of ancestor
- n = number of generations going back

The time span is a function of the number of generations and the average time between generations:

tS = n * gT

where:

- tS = Time Span of all generations
- n = number of generations
- gT = average time between generations

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