# Fibonacci number calculator

## World's simplest number tool

Quickly calculate a sequence of Fibonacci numbers in your browser. To get your sequence, just specify the starting value and the length of the sequence in the options below, and this utility will generate that many Fibonacci numbers. Created by developers for developers.

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Fibonacci number calculator tool
What is a fibonacci number calculator?

This is an online browser-based utility for calculating a list of Fibonacci numbers. Fibonacci numbers form a numerical sequence that describes various phenomena in art, music, and nature. Its peculiarity is that the sum of two adjacent numbers in the sequence determines the value of the number following them (for example, 1 + 1 = 2; 2 + 3 = 5, etc.), and the ratio of adjacent numbers in the series is close to the golden mean. The first elements of the Fibonacci sequence are the numbers F₀ = 0, F₁ = 1 (or sometimes F₀ = 1, F₁ = 1) and in this tool, you can choose from which number to start generating the series. You can specify the desired number of Fibonacci elements, as well as customize the output by selecting any character to separate them. That's numberwang!

Fibonacci number calculator examples
Click to use

First Thirty Fibonacci Numbers

In this example, we generate the first thirty numbers of the Fibonacci sequence. We include the zero value in the sequence (F₀ = 0) and the initial pair of numbers is F₀ = 0 and F₁ = 1. In some older literature you'll find that the sequence starts with the pair F₀ = 1 and F₁ = 1 but that doesn't change anything.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, 17711, 28657, 46368, 75025, 121393, 196418, 317811, 514229

**Required options**

Start Fibonacci numbers at
this value.

Calculate this many Fibonacci
numbers.

Enter your custom Fibonacci
number delimiter.
(By default a line break.)

Fibonacci Numbers from One Million

In this example, we find Fibonacci numbers with values exceeding one million. We generate 10 such numbers and display each of them on a new line.

1346269
2178309
3524578
5702887
9227465
14930352
24157817
39088169
63245986
102334155

**Required options**

Start Fibonacci numbers at
this value.

Calculate this many Fibonacci
numbers.

Enter your custom Fibonacci
number delimiter.
(By default a line break.)

Pro tips
Master online number tools

You can pass options to this tool using their codes as query arguments and it will automatically compute output. To get the code of an option, just hover over its icon. Here's how to type it in your browser's address bar. Click to try!

https://onlinenumbertools.com/calculate-fibonacci-numbers?&start=0&count=30&separator=%2C%20

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