The Dickinson College Commentaries Core Latin and Ancient Greek Vocabularies represent the most common words in Latin and Ancient Greek, based on large hand-analyzed data sets.
The Latin list has roughly a thousand headwords or lemmas, the Greek five hundred.
These account for approximately 70-80% of the word forms found in a typical text, excluding proper names.
For Caesar's Gallic War , the figure is 91%; for Vergil's Aeneid , 81%.
66% of the words in Sophoc.