A scribe in Alexandria, around the year 200 CE, held two scrolls side by side. One was the Septuagint in Greek. The other was the Hebrew Torah. He noticed something the translators had not: both alphabets carried numbers. The Greek alpha was 1, beta 2, gamma 3. The Hebrew aleph was 1, bet 2, gimel 3. But the systems diverged after that. Gematria and isopsephy both assign numerical values to letters, but they emerged from different languages, cultures, and mystical traditions — gematria is the Hebrew practice of interpreting words by their numerical sum, while isopsephy is its Greek counterpart, used for philosophical and magical correspondences.
How Did Gematria and Isopsephy Develop?
The earliest clear evidence of gematria appears in the Talmudic period, around the 2nd century CE. The Mishnah (Avot 3:18) uses the phrase “the reckoning of the word” — cheshbon ha-davar — to describe the practice of deriving meaning from letter values. By the 3rd century, rabbinic midrashim were using gematria to interpret Torah verses. The Sefer Yetzirah (Book of Creation), composed between the 2nd and 6th centuries CE, built a full cosmology on the numerical structure of the Hebrew alphabet: 22 letters, each with a value, arranged into the 32 paths of wisdom.
Isopsephy has an older written record. The Greek word isopsēphos (ἰσόψηφος) means “equal in number.” The earliest surviving example is a graffito from Pompeii (before 79 CE) reading “Φιλω ης αριθμος φμε”, “I love her whose number is 545.” But the practice predates that. The Pythagorean school in the 6th century BCE treated numbers as the essence of reality, and by the 4th century BCE Greek magical papyri were using letter values for spells. The most famous isopsephic line in history is the number of the Beast in Revelation 13:18: 666, the sum of the Greek letters in Neron Kaisar (Nero Caesar) when transliterated into Hebrew.
The two systems grew in parallel but never merged. Jewish mystics in the 13th century (the Zohar, the Bahir) expanded gematria into a full exegetical tool. Greek philosophers like Iamblichus (c. 245–325 CE) used isopsephy to explain the relationships between gods and numbers. Both systems assume that language is not arbitrary, that letters carry numerical weight, and that weight reveals hidden order.
What Do the Numbers Mean in Each System?
In gematria, the numbers are not just quantities. They are qualities. The Hebrew letter aleph (1) represents unity, the one God. Bet (2) represents duality, creation, the house. When two words share the same sum, they are said to be connected in meaning. For example, chai (life) sums to 18, and tov (good) sums to 17, close but not identical, which Kabbalists interpret as life being one step beyond good.
Isopsephy treats numbers more abstractly. A Greek word’s sum reveals its place in a cosmic hierarchy. The name Zeus (ΔΙΑΣ) sums to 215, while Theos (ΘΕΟΣ) sums to 284. These numbers were used in theurgy, the practice of invoking gods through numerical sequences. The Greek magical papyri (PGM) contain instructions like “say the name whose number is 3663” without spelling the name aloud, trusting the number to carry the power.
The difference is one of purpose. Gematria is primarily exegetical: it uncovers meanings already hidden in scripture. Isopsephy is often operative: it generates names, seals, and formulas for ritual use. A Kabbalist reads gematria to understand God. A Greek magician uses isopsephy to contact a god.
How Are the Alphabets Structured Differently?
Hebrew has 22 letters, each with a single numerical value. The first nine (aleph to tet) are 1 through 9. The next nine (yod to tzadi) are 10 through 90. The final four (kof, resh, shin, tav) are 100, 200, 300, 400. There is no letter for 500 or above, those values are formed by combining letters (e.g., 500 = tav + kof, 400+100). This limits the maximum sum of a single word to about 400 per letter, but words can be long.
Greek has 24 letters, but classical isopsephy uses 27 symbols by adding three obsolete letters: digamma (6), koppa (90), and sampi (900). This gives a continuous sequence from 1 to 900. Alpha through theta are 1–9, iota through pi are 10–80, kappa through omega are 20–800, with the three extras filling gaps. The system allows any number from 1 to 999 to be expressed as a single letter or a pair.
The practical consequence: Greek isopsephy can encode a wider range of numbers concisely. Hebrew gematria often requires multiple words to reach large sums. But Hebrew’s smaller alphabet also means fewer possible sums, making coincidences more frequent, and therefore more meaningful to the interpreter.
Which Traditions Use Each System?
Gematria is central to Kabbalah. The Zohar (13th century) uses gematria to link verses across the Torah. The 16th-century Safed mystics, including Isaac Luria, developed gematria shelemah (complete gematria) where the value of a letter’s name is also counted. For example, aleph is not just 1 but 1+30+80 = 111. This multiplies the interpretive possibilities. Gematria also appears in medieval Jewish magic (Sefer Raziel, Shimmush Tehillim), where psalms are recited for their numerical sums.
Isopsephy appears in Hellenistic magic, Gnostic texts, and early Christian numerology. The Sibylline Oracles (2nd century BCE–4th century CE) use isopsephic riddles. The Chaldean Oracles (2nd century CE) describe numbers as “the fathers of the gods.” In the Greek Magical Papyri, isopsephy is used to create voces magicae, nonsense words that derive their power from numerical equivalence to divine names.
A third related system is abjad, used in Arabic and Persian mysticism. Abjad assigns values to the 28 Arabic letters (1–9, 10–90, 100–900, 1000). It appears in Islamic numerology (ilm al-huruf) and Sufi meditation. The Bismillah (بسم الله الرحمن الرحيم) sums to 786, a number often written as a blessing.
Common Misconceptions About Gematria and Isopsephy
They are the same thing. They are structurally analogous but culturally distinct. Gematria is Hebrew and exegetical; isopsephy is Greek and often magical. Using the terms interchangeably confuses the traditions.
Gematria works on any language. Gematria is tied to the Hebrew alphabet. Applying it to English or Latin requires a transliteration system (e.g., A=1, B=2) that has no historical basis. Modern “English gematria” is a 20th-century invention with no roots in Kabbalah.
Isopsephy is only for the number 666. That is the most famous example, but isopsephy was used for hundreds of names and concepts. The Sator Square (SATOR AREPO TENET OPERA ROTAS) is an isopsephic palindrome where each word sums to a multiple of 5.
The numbers are arbitrary. Both systems assume the numbers are inherent in the language, not assigned by convention. A Kabbalist would say the Torah was given with its numerical values. A Greek magician would say the gods revealed the numbers. The assignment is not random, it is discovered.
FAQ
Can you use gematria on Greek words? Not directly. You would need to transliterate Greek into Hebrew letters, which changes the values. Isopsephy is the correct system for Greek.
What is the value of 666 in gematria? In Hebrew, 666 is the sum of Neron Kaisar (נרון קסר) when spelled with the vav in Nero. Without the vav, it is 616, a variant found in some early manuscripts of Revelation.
Which is older, gematria or isopsephy? Isopsephy has earlier surviving examples (Pompeii, 1st century CE), but both likely emerged around the same period, the Hellenistic era (3rd–1st centuries BCE), when alphabets were used for numbering in commerce and then adopted for mysticism.
Are there modern uses for these systems? Yes. Kabbalists still use gematria for Torah study. Modern occultists (Thelema, Golden Dawn) revived isopsephy for ritual work. The number 93 in Thelema is isopsephic for Thelema (will) and Agape (love).
The distinction between gematria and isopsephy is not academic hair-splitting. It is the difference between reading a text as a divine cipher and using a number to call a god. Both systems rest on the same conviction, that letters are not arbitrary marks, but weights that carry the universe’s structure. If you want to explore how these numbers work in practice, our guide to Kabbalah covers gematria in depth, and the glossary of Hebrew letter values provides a reference table. For the Greek side, see our article on isopsephy and the Greek magical papyri.