How much of the English language is taken from other languages?

Nearly 80 percent or more of the English language has its origins from other languages and the development over time from Old English, Middle English and Modern English. Greek, Latin, Germanic languages, French, Roman and others had their influence on English. Many of the medical and scientific words come from Greek and Latin.

The other modern words which don't have true origins from other languages came from slang words, new inventions and discovery, and were made up as new words were needed.