Open three different Bibles and you may find three different book counts. That surprise puzzles many believers who simply want a straight answer. The short version is that Protestants count 66, Catholics 73, and some Orthodox churches more. Learning the Biblical Scriptures and Patterns behind how books are grouped makes those numbers make sense. This guide explains each count, how the books are arranged, and why the lists differ, so you can read with greater confidence.
The Short Answer: 66 Books in Most Protestant Bibles
The Bible most American Protestants read contains 66 books. Thirty-nine belong to the Old Testament and 27 to the New Testament. If you grew up with the King James Version, the NIV, the ESV, or the NKJV, this is the collection you know.
The number is the same across these translations because translation choice affects wording, not which books are included. A Bible in modern English and one in Elizabethan English contain the same 66 books in the same basic order.
The 66 books are not a single volume written by one person. They are a library of narratives, laws, poems, prophecies, letters, and gospel accounts. Traditionally, Christians understand that library to have been written by roughly 40 authors over about 1,500 years, though scholars discuss the exact figures.
How the 39 Old Testament Books Are Arranged
The Old Testament follows a thematic order rather than a strict timeline. Protestant Bibles group the 39 books into five categories, which helps readers know what kind of writing they are opening.
The Law and the Historical Books
The first five books (Genesis, Exodus, Leviticus, Numbers, and Deuteronomy) form the Law, also called the Pentateuch or the Torah. They cover creation, the story of Abraham’s family, the exodus from Egypt, and the covenant given at Sinai.
Twelve historical books follow, running from Joshua through Esther. They trace Israel’s story from entering the land of Canaan, through the judges and kings, to the exile and return. Samuel, Kings, and Chronicles each appear as two books in English Bibles, which is one reason counts differ from Jewish editions.
Wisdom Literature and the Prophets
Five books of poetry and wisdom come next: Job, Psalms, Proverbs, Ecclesiastes, and Song of Solomon. These are the most personal books in the Old Testament, filled with prayers, reflection, and practical guidance for daily life.
The prophets close the Old Testament. Five longer books (Isaiah, Jeremiah, Lamentations, Ezekiel, and Daniel) are called the Major Prophets. Twelve shorter books, from Hosea to Malachi, are the Minor Prophets. “Major” and “minor” describe length, not importance.
The tally is simple: 5 + 12 + 5 + 5 + 12 equals 39.
How the 27 New Testament Books Are Organized
The New Testament is shorter and easier to map. It begins with four Gospels (Matthew, Mark, Luke, and John), each presenting the life, death, and resurrection of Jesus from a distinct angle. Acts follows as a single historical book describing the early church’s growth.
Thirteen letters are attributed to the apostle Paul, from Romans through Philemon. Some are addressed to churches, such as Corinth and Philippi, while others, like Timothy and Titus, are written to individual leaders.
Eight more letters are called the General Epistles: Hebrews, James, 1 and 2 Peter, 1, 2, and 3 John, and Jude. Revelation closes the collection with its prophetic vision of the end of the age.
Add it up and you get 4 + 1 + 13 + 8 + 1, which equals 27. This count is shared by Protestants, Catholics, and Orthodox churches, so the New Testament is the least disputed part of the question.
Why Catholic and Orthodox Bibles Contain More Books
Most of the disagreement concerns the Old Testament. Early Greek-speaking Christians commonly used the Septuagint, a Greek translation of the Hebrew Scriptures that circulated before the time of Jesus. It included several writings that were not part of the Hebrew text later standardized in Jewish tradition.
The Deuterocanonical Books in Catholic Editions
Catholic Bibles include seven additional books, known as the deuterocanonical books, meaning “second canon.” They are Tobit, Judith, 1 Maccabees, 2 Maccabees, Wisdom, Sirach (also called Ecclesiasticus), and Baruch. Catholic editions also contain additional passages in Esther and Daniel.
The Council of Trent formally affirmed this list in 1546, but the books had been read in Christian worship for many centuries before that. Adding seven to the Protestant Old Testament gives 46 Old Testament books and a total of 73.
Protestant churches generally call these writings the Apocrypha. Many Protestants see them as useful for historical background and spiritual reflection but not as Scripture on the same level as the 66 books. Some older Protestant Bibles, including early editions of the King James Version, printed them in a separate section.
Orthodox and Other Traditions
Eastern Orthodox churches accept the Catholic additions and often more, though the exact list varies by tradition. Writings such as 1 Esdras, the Prayer of Manasseh, Psalm 151, and 3 Maccabees appear in many Orthodox editions. Because practice differs among churches, a single Orthodox total is hard to give.
The Ethiopian Orthodox Tewahedo Church uses an even broader canon, and its total is commonly cited as 81 books. If you meet a Bible with a number that surprises you, check which church tradition published it before assuming something is wrong.
Why the Jewish Scriptures Count 24 Books
Jewish readers use the Tanakh, an acronym for its three divisions: Torah (Law), Nevi’im (Prophets), and Ketuvim (Writings). Its content matches the Protestant Old Testament almost exactly, yet the count is 24 rather than 39.
The difference comes from how books are bundled. The twelve Minor Prophets are treated as one book. Samuel, Kings, and Chronicles are each counted as one book rather than two. Ezra and Nehemiah are also joined together.
This is a helpful reminder that a book count measures how a tradition divides the text, not how much text it contains. Two people can hold the same words and honestly report different numbers.
Book Counts by Tradition at a Glance
The table below compares the main counts side by side. The Orthodox and Ethiopian figures are approximate because churches within those families do not all use an identical list.
| Tradition | Old Testament | New Testament | Total | Key Difference |
|---|---|---|---|---|
| Protestant | 39 | 27 | 66 | Follows the Hebrew Old Testament contents |
| Roman Catholic | 46 | 27 | 73 | Adds seven deuterocanonical books |
| Eastern Orthodox | Varies | 27 | Often cited as 76 to 78 | Includes additional Septuagint writings |
| Ethiopian Orthodox | Broader canon | Broader canon | Commonly cited as 81 | Uses an expanded list of both testaments |
| Jewish Tanakh | 24 | None | 24 | Combines books such as the Twelve Prophets |
Notice that every Christian tradition shares the same 27 New Testament books in the main lists, while the Old Testament is where differences appear. That pattern is a good starting point for any conversation about why Bibles differ.
How the Canon Took Shape
The word canon comes from a Greek term meaning “rule” or “measuring stick.” It refers to the list of books recognized as Scripture. That list was not announced in a single moment. It developed as churches recognized which writings had been received and used in worship across the Christian world.
For the New Testament, one well-known milestone is Athanasius of Alexandria’s Easter letter in AD 367, which named the same 27 books Christians recognize today. Church councils at Hippo (393) and Carthage (397) also listed them. These gatherings largely confirmed what many congregations already treated as authoritative.
The Old Testament question took longer to settle in the West. During the Reformation, Protestant leaders returned to the Hebrew collection as their standard, while the Catholic Church reaffirmed its larger list at Trent. That is why the 66 versus 73 divide exists today.
Patterns That Help You Navigate the Books
Once you know the groupings, Scripture feels less like a maze and more like a well-labeled library. Several simple observations help new readers.
The Old Testament contains 929 chapters and the New Testament 260, for a total of 1,189 in the Protestant Bible. Psalms has the most chapters at 150, and it includes Psalm 119, the longest chapter. Psalm 117 is the shortest. The Bible’s middle falls near the Psalms, which suits a book of prayer and praise.
Book order is by type, not date. Job may be among the older writings, yet it sits in the middle of the Old Testament. Paul’s letters appear before the Gospels in time, yet the Gospels come first on the page. Knowing this prevents confusion when a timeline does not match the table of contents.
Categories also tell you how to read. A law passage calls for attention to context and covenant. A psalm invites you to read it as poetry. A letter is best read in one sitting, the way its first recipients would have heard it.
Practical Tips for Choosing and Reading a Bible
If you are buying a Bible or recommending one to a friend, start by deciding which tradition’s canon you need. A Protestant church will usually use a 66-book Bible, while a Catholic parish will use a 73-book edition. Check the table of contents rather than relying on the cover.
Study Bibles often include a short essay on the canon and an introduction to each book. These are valuable because they explain authorship, setting, and purpose in plain language. Look for one published by a source your church community trusts.
For first-time readers, a common approach is to begin with a Gospel such as Mark or John, then move to Acts and a short letter like Philippians. After that, read Genesis and the Psalms. Reading the shorter books first builds confidence, and the habit matters more than the speed.
If you read the deuterocanonical books for the first time, treat them as you would any historical source: notice what they say about Jewish life between the Testaments, and ask your pastor or priest how your tradition uses them.
Finally, avoid reading the number as a measure of faith. A Christian with a 66-book Bible and one with a 73-book Bible still share the Gospels, the creeds, and the central message of Christ. Understanding the difference is a way to appreciate church history, not to argue.
Conclusion
The answer depends on whose Bible you hold. Protestant editions contain 66 books, Catholic editions 73, Orthodox traditions somewhat more, and the Jewish Tanakh counts 24 because of how it groups the same material. The 27 New Testament books are shared across Christian traditions, so the differences center on the Old Testament. Knowing how the books are arranged and how the canon developed gives you a map for any reading plan. Pick a trustworthy edition, start with a Gospel, and let the library unfold one book at a time.
Frequently Asked Questions
How many books are in the Bible altogether?
It depends on the tradition. Protestant Bibles have 66 books, Catholic Bibles have 73, and Orthodox Bibles contain more, with totals that vary by church. The Jewish Tanakh counts 24 books.
Why does the Catholic Bible have more books than the Protestant Bible?
Catholic Bibles include seven deuterocanonical books that were part of the Greek Septuagint used by early Christians. Protestant churches follow the shorter Hebrew list, a choice emphasized during the Reformation.
How many books are in the Old Testament and the New Testament?
The Protestant Old Testament has 39 books and the New Testament has 27. Catholic Bibles have 46 Old Testament books and the same 27 New Testament books.
Do different Bible translations have different numbers of books?
Not usually. Translations such as the KJV, NIV, and ESV all use the same 66-book Protestant canon. Differences in count come from the tradition behind an edition, such as a Catholic Bible, not from the translation style.
Who decided which books belong in the Bible?
No single person decided. The canon developed as churches recognized the writings already in use and honored in worship. Church leaders and councils, including Athanasius in 367 and the councils of Hippo and Carthage, later confirmed lists, especially for the New Testament.
