Fibonacci Number Calculator

For any number chosen ≤ 1477

A Fibonacci number is defined by the two previous Fibonacci numbers in the sequence:

n = (n - 1) + (n - 2)

The calculator returns either the nth Fibonacci number for any n ≤ 1477 or the sequence of Fibonacci numbers up through n. To use the calculator simply enter the number for which you would like the Fibonacci number, Fibo(n) or Fibonacci sequence computed.

The 1477 limit is due to the 64-bit computer architecture which is limited in the size of numbers it can manage to numbers less than 2⁶⁴.

Enter a number and hit the button: Number, n ≤ 1477
Select either nth or list:

Fibo(n) =

Reload the browser window/tab between calculations if you don't want successive calculations appended.