The Bible never gives the total, so any answer comes from adding up the ages in its genealogies. Using the Hebrew text, that gives about 4,000 years from Adam to Jesus, and using the Greek Septuagint about 5,500, a gap of roughly fifteen centuries. So when someone offers you one confident figure, they have chosen a text without telling you.

Where 4004 BC comes from
The figure many people know comes from James Ussher, Archbishop of Armagh, who published a chronology in 1650 that put creation at the evening before 23 October 4004 BC. Ussher was a serious scholar and his work was careful. But for two centuries it was printed in the margins of English Bibles, and that is how a seventeenth-century calculation came to look like part of the text. It is not, because no edition of Scripture in any original language carries a date.

Why the manuscripts give different totals
The genealogies of Genesis 5 and 11 give each man’s age at the birth of his son, and adding those ages chains the generations together. The trouble is that the manuscript traditions that have come down to us disagree about the ages. The Hebrew Masoretic text, the Greek Septuagint and the Samaritan Pentateuch each give different figures, and the Septuagint’s are systematically longer. From Adam to Abraham the difference adds up to something like 1,300 to 1,500 years. These are three coherent systems rather than small copying slips, and scholars have argued for centuries about which is original.

Gaps in the genealogies
The genealogies in the Bible also do not always list every generation, and the New Testament shows it in a passage anyone can check. Matthew arranges his genealogy in three sets of fourteen and says so plainly (Matthew 1:17), and to make the numbers work he leaves people out. Between Joram and Uzziah in Matthew 1:8 there should be three kings, Ahaziah, Joash and Amaziah, who are in 2 Kings and 2 Chronicles but not in Matthew.
Matthew has not made a mistake, because the Hebrew verb translated “was the father of” comfortably means “was the ancestor of,” and he is building a pattern rather than taking a census. So we cannot assume that a genealogy is a complete chain, and adding up its years depends on assuming exactly that.

What we can say about the dates
From Abraham on, the chronology is anchored to events with evidence outside the Bible, and its broad shape is reasonably firm: Abraham somewhere in the early second millennium BC, the exodus, whose date is disputed, somewhere between roughly the fifteenth and thirteenth centuries, David around 1000 BC, and the fall of Jerusalem in 586 BC, a date fixed by Babylonian records. Before Abraham, back to Adam, the figure is whatever the text and the assumptions we choose produce.
Christians hold a wide range of positions on the age of the earth, in good faith, and the genealogies are not the only thing that bears on it. It is more useful to say so than to pretend the sums are settled.

What the genealogies are for
The genealogies were never chronological tables, and when we read them as tables we read past what they are saying. Genesis 5 is a chapter about mortality: nine paragraphs end in the same five words, and then he died, with one exception, where God takes a man away. Matthew’s genealogy is an argument about who Jesus is, the son of David, the son of Abraham, and it names four women whose stories are complicated, Tamar, Rahab, Ruth and the wife of Uriah. Luke’s runs the other way, back past Abraham to the son of Adam, the son of God (Luke 3:38), and that is the claim his whole list exists to make. Each list is teaching us about God and his people, and the arithmetic is something later readers brought to them.

Frequently asked
How many years from Adam to Jesus?
Scripture gives no total, but adding up the genealogies yields roughly 4,000 years using the Hebrew text and about 5,500 using the Greek Septuagint.
How many generations from Adam to Jesus?
Luke’s genealogy (Luke 3:23–38) has 77 names from Jesus back to God, which puts Adam 75 generations before Jesus. It includes Cainan between Arphaxad and Sala (Luke 3:36), a name found in the Septuagint’s Genesis 11 but not in the Hebrew. Matthew starts later and counts 42 generations from Abraham to Christ, in three sets of fourteen (Matthew 1:17).
Where does 4004 BC come from?
It comes from James Ussher’s chronology of 1650, which was later printed in the margins of English Bibles, but it is not part of the text.
Why do the manuscripts disagree?
The Masoretic text, the Septuagint and the Samaritan Pentateuch give different ages in Genesis 5 and 11, and the Septuagint’s are systematically longer.
Do biblical genealogies list every generation?
Not always. Matthew 1:8 leaves out three kings, Ahaziah, Joash and Amaziah, to keep his three sets of fourteen, and the Hebrew idiom allows it.
What are the genealogies for?
Each makes an argument rather than keeping count of years: Genesis 5 is about mortality, Matthew’s about David and Abraham, and Luke’s runs back to “the son of Adam, the son of God.”
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