I entered part of a poem that I wrote just for fun and this is the answer I got:
Your English is 83 percent Shakespearean.
The waters of the Avon almost lap at your feet.
How fun that I use 83% of the Bard's words.
How Shakespearean are you?
Shakestext by Carl Bettis is licensed under a http://creativecommons.org/licenses/by/3.0/us/