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Fibonacci
The exact nth Fibonacci number.
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The exact nth Fibonacci number. Runs in the browser. Nothing is uploaded.
About this tool
Get any term of the Fibonacci sequence 0, 1, 1, 2, 3, 5, 8, … Enter its position n and the tool returns the exact value without rounding, even when it has hundreds of digits.
How to use it
- 01
Enter the position n.
- 02
Read F(n), the nth Fibonacci number.
- 03
Copy the full value.
FAQ
Frequently asked questions
Where does the sequence start?
With F(0) = 0 and F(1) = 1; every next term is the sum of the two before it.
Is the result exact for large n?
Yes. The calculation uses arbitrary-precision integers, so every digit is correct.