Fibonacci Number Calculator
Online calculator and formulas for calculating an index of the Fibonacci series
This calculator returns a Fibonacci number from the Fibonacci series for the given index. Enter the index you are looking for and click the 'Calculate' button.
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Formula of the Fibonacci function
The Fibonacci sequence is the infinite sequence of numbers which either begins with the double number 1 or is more often provided with a leading number 0. The sum of two consecutive numbers results in the following number:
1, 1, 2, 3, 5, 8, 13,...
The formula calculates the Fibonacci number at the index from a series with a leading number 0. The above calculator also used this formula.
0, 1, 1, 2, 3, 5, 8, 13,...
More special functions
Airy • Derivative Airy • Bessel-I • Bessel-Ie • Bessel-J • Bessel-Je • Bessel-K • Bessel-Ke • Bessel-Y • Bessel-Ye • Spherical-Bessel-J • Spherical-Bessel-Y • Hankel • Beta • Incomplete Beta • Incomplete Inverse Beta • Binomial Coefficient • Binomial Coefficient Logarithm • Erf • Erfc • Erfi • Erfci • Fibonacci • Fibonacci Tabelle • Gamma • Inverse Gamma • Log Gamma • Digamma • Trigamma • Logit • Sigmoid • Derivative Sigmoid • Softsign • Derivative Softsign • Softmax • Struve • Struve table • Modified Struve • Modified Struve table • Riemann Zeta
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