How many books and sermons did St. Augustine write?

St. Augustine was an exceptionally prolific author whose surviving works have profoundly influenced Western thought. While exact counts can vary depending on how individual texts are categorized, historical records indicate that he wrote more than 100 books and approximately 500 sermons.1

These writings represent a massive body of work, totaling more than five million words. Regarding his output:2

• Books: More than 100 titled works survive, many of which were written to address the various ecclesiastical controversies of his time, such as those involving the Manichaeans, Donatists, and Pelagians.3
• Sermons: Sermons account for nearly one-third of his surviving works, totaling over 1.5 million words. Many of these were recorded by shorthand scribes as he spoke extemporaneously to his congregation in Hippo. Notable collections include his Enarrationes in Psalmos and his tractates on the Gospel of John.3