Fibonacci Calculator
The Fibonacci sequence starts 0, 1, 1, 2, 3, 5, 8… — each term is the sum of the previous two.
Calculator
Fibonacci Calculator
Result
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Formula
F(n) = F(n−1) + F(n−2)
Step-by-step
- 1
Enter the term index
F(0) = 0 and F(1) = 1.
- 2
Read the term
The nth Fibonacci number is shown.
Worked example
Example input: n: 10
Result: 55
Related tools
- Factorial Calculator
Another classic sequence.