KLOORAFibonacci Calculator
Find the nth Fibonacci number and the golden ratio approximation.
Quick answer: Fibonacci Calculator: Find the nth Fibonacci number and the golden ratio approximation. Everything runs in your browser, so nothing you enter is uploaded or stored.
How to use Fibonacci Calculator
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
Features
- Instant results
- Free, no signup
- Runs in your browser, nothing is uploaded
- Works on phone and desktop
Formula
F(n) = F(n-1) + F(n-2).
Worked example
F(20) is 6,765.
Frequently asked questions
What is the Fibonacci sequence?
Each number is the sum of the two before it: 0, 1, 1, 2, 3, 5, 8.
How large can n be?
Up to 78 for exact results in this tool.
Is the Fibonacci Calculator free?
Yes. It is free, needs no signup and works on any device.