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Fibonacci Calculator


Quickly calculate Fibonacci sequences or single numbers with our free online tool.



Fn = 0


* Only needed for a fibonacci sequence


Fibonacci Sequence

Fn1 to Fn2
n Fn
0 0

Also go see our Fibonacci Retracement Calculator

Fibonacci Sequence Formula

The formula for the Fibonacci sequence is:

Fn = Fn-1 + Fn-2

Where:

  1. Fn represents the nth number in the sequence
  2. Fn-1 represents the (n-1)th number in the sequence
  3. Fn-2 represents the (n-2)th number in the sequence

To calculate any number in the sequence, you simply add the two preceding numbers. For example, to calculate the 10th number in the sequence, you would add the 8th and 9th numbers together (21 + 34), which equals 55.

Here is an example of how the formula works:

F6 = F5 + F4

= 5 + 3

= 8

So, the 6th number in the sequence is 8.

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