Nth Fibonacci Number Calculator

Find the nth Fibonacci number.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator finds the nth Fibonacci number — from the sequence where each number is the sum of the two before it (0, 1, 1, 2, 3, 5, 8, 13...) — using either the recurrence relation or Binet's closed-form formula for large values of n.

Computer science students use it as a classic exercise in recursion, memoization and algorithmic complexity, and math enthusiasts use it to explore where the sequence shows up in nature, art and the golden ratio. Just enter which position in the sequence you want.

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