Tools4noobs
The tool calculates F(n) - Fibonacci value for the given number, as well as the previous 4 values, using those to display a visual representation. Because the Fibonacci value for 20000 has 4179 decimals and it needs quite an impressive amount of processing, the maximum allowed value is 20000. If you need the result for higher values, please don't hesitate to contact us.

Open Fibonacci calculator

How it works

This tool uses the Math_Fibonacci package for PEAR (PHP library). The algorithm takes advantage of the golden ratio and is able to give you the result quickly. However, since the complexity is very high for large numbers this tool is limited to F(20000).