How to Pronounce the Greek Alphabet

Greek pronunciation is unusually regular: every letter has a fixed sound, no letter is ever silent, and the same letter is read the same way in every word. This makes Greek much easier to read aloud than English. The wrinkle is that pronunciation has changed substantially over 2,500 years — what's right in Plato is not what's right in Athens today. This guide gives you both, plus the English conventions used in mathematics and science.

There are three pronunciation systems you'll encounter:

• Modern Greek — what 13 million people speak today; the right choice for travel, Greek language study, and naming Greek brands or places.
• Ancient (Classical) Greek — reconstructed from inscriptions and ancient grammarians; used in classics departments and biblical Greek courses. Often called "Erasmian pronunciation" in textbook form.
• English mathematical convention — how mathematicians, physicists, and engineers say letter names in English (e.g. "pie" for π, not "pee"). Often quite different from any actual Greek pronunciation.

Complete Pronunciation Table

"Modern" gives the sound the letter makes in modern Greek; "Ancient" reflects the reconstructed classical pronunciation. The English column shows how the letter name is typically said when reading equations aloud. IPA is in brackets.

The Biggest Modern vs. Ancient Differences

Several letters shifted pronunciation between classical times and today. If you've studied biblical or classical Greek and find yourself confused by spoken Greek in Athens, these are the changes responsible:

• β beta: Was [b] in classical times; became [v] by the early Byzantine era. So βιβλίο ("book") is "vivlio" in modern Greek, not "biblio".
• γ gamma: Was a hard [g]; became a softer fricative [ɣ] (a bit like a voiced "h"). Before e or i sounds it palatalizes to [j], like English "y".
• δ delta: Was [d]; became [ð] (the "th" in "this"). Modern Greek uses ντ to write a [d] sound.
• η eta, υ upsilon, ει, οι: All four merged into [i] — this phenomenon is called iotacism. It's why modern Greek has so many ways to spell the same vowel sound.
• φ phi, θ theta, χ chi: Were aspirated stops ([pʰ], [tʰ], [kʰ]) — like English "pin", "tin", "kin" with an extra puff of air. They became fricatives ([f], [θ], [x]) by late antiquity.

Diphthongs and Letter Combinations

Several common two-letter combinations have specific sounds that differ from the individual letters. These are essential for reading Greek words correctly:

Modern Greek has no native [b], [d], or hard [g] sounds at the start of native words — the language fills these gaps with the digraphs μπ, ντ, and γκ when borrowing or transcribing foreign words.

Accent and Stress

Modern Greek words always have exactly one stressed syllable, marked by an acute accent (´): μάθημα (lesson) is stressed on the first a, written μά. Stress is mandatory and changes meaning in a few minimal pairs, so the accent mark is part of standard spelling. Ancient Greek used three accent marks (acute, grave, circumflex) plus rough and smooth breathings — see our ancient vs. modern Greek page for details.

How English Speakers Read Greek Letters in Math

English-speaking mathematicians use a third system that's neither modern nor ancient Greek. It evolved from Renaissance Latin pronunciations of Greek borrowed via Erasmian scholarship, with further English vowel shifts on top. A few specifics worth knowing:

• π is "pie" in math, not "pee" — to avoid confusion with the letter P.
• χ is "kye" (rhymes with "sky") in chi-squared, χ². Not "chee" or "chi" with an English ch.
• ξ is often "zye" or "ksee"; both are accepted.
• ψ is "sigh" — the P is silent in English, even though Greek pronounces it.
• τ is "tau" — rhyming with "now" is most common in physics; "taw" is more common in finance.

For per-letter audio and worked examples, see each letter's individual page (start with alpha) or the beginner's guide.