lingholic.com

Me7Om TIL the Oxford English Dictionary contains over 170,000 words in current use, whereas a vocabulary of just 3000 words provides coverage for around 95% of common texts. If you do the math, that's 1.75% of the total number of words in use.
aOaJ TIL that mastering just 3,000 words in English will make you able to understand around 95% of common texts