Greek Isopsephy Explained: The Greek Gematria System

Isopsephy is the Greek-language counterpart to Hebrew gematria: every letter of the Greek alphabet also functions as a number, and isopsephy is the practice of summing those numbers to find the numeric value of a word or phrase. The word itself comes from Greek roots meaning "equal" (isos) and "pebble" (psephos) — a reference to pebbles historically used for counting and calculation.

How the Greek numeral system works

The 24 standard letters of the Greek alphabet run α (alpha) = 1 through ω (omega) = 800 in ones, tens, and hundreds groupings — the same underlying logic as Hebrew's numeral structure. Three archaic letters no longer used in ordinary writing (digamma, qoppa, and sampi) fill the remaining gaps at 6, 90, and 900, so every value from 1 to 900 is represented. See the complete Greek letter value chart.

Isopsephy and the "number of the beast"

The most famous application of isopsephy in Western culture is the debate over 666, "the number of the beast," from the Book of Revelation. Because the New Testament was written in Greek, scholars have spent centuries using isopsephy to test candidate names and titles against 666 — the transliterated Greek/Hebrew rendering of the Roman emperor Nero's name and title is among the most widely cited historical-critical explanations, though it remains debated rather than definitively settled. The passage also has a documented textual variant worth knowing: while most manuscripts read 666, some early witnesses — including the third-century Papyrus 115 — read 616 instead, which is itself part of the scholarly debate. See our full treatment in Gematria in the Bible.

Calculating isopsephy without a Greek keyboard

Our Greek calculator supports both direct Greek text entry and Beta Code — a decades-old ASCII transliteration standard (a=α, b=β, th=θ, and so on) that lets you type Greek words using an ordinary keyboard and still get an accurate isopsephy value.

Where isopsephy shows up historically

Beyond biblical scholarship, isopsephy appears throughout Greek magical papyri, in philosophical and Gnostic circles, and in graffiti and inscriptions from the ancient Mediterranean world, where writers would leave a name's isopsephy value as a kind of numeric signature. For the broader historical context connecting Hebrew, Greek, and English systems, see The History of Gematria.