How do I pronounce the German diphthongs ei, ai, ie, eu/äu, and au?

German diphthongs are very consistent: ei/ai sound like "eye" , ie sounds like a long "eee" , eu/äu sound like "oy" , and au sounds like "ow" . If you memorize these four patterns, you can pronounce many German words correctly right away.

What is the easiest way to remember the difference between ei and ie?

A helpful rule is the Einstein rule : ei is pronounced like "eye" . By contrast, ie is pronounced like "eee" , so words like Wein and Wien sound very different even though they look similar.

Are eu and äu pronounced differently in German?

No, eu and äu have the same pronunciation: "oy" . For example, Freund and Häuser both use that oy sound.

Diphthongs — When Vowels Team Up 👯‍♂️🎶

German diphthongs are vowel combinations that produce a single sound. The most vital rules: EI sounds like the word 'eye' (mein, sein), while IE just produces a long 'ee' sound (liegen, fliegen). EU and ÄU both sound like 'oy' (Deutsch, Häuser).

Infographic explaining German diphthongs (ei, ie, eu, etc.) and how to pronounce them.

A Diphthong is a fancy word for "two vowels that make one new sound." In German, these combinations are super consistent. Once you learn them, you can read almost anything! 📖

1. EI and AI (The "Eye" Sound) 👁️

Whenever you see ei or ai, pronounce it like the English word "eye" or "my."

mein (my)
nein (no)
Mai (May)
Arbeit (work)

[!TIP]
The Einstein Rule: Think of Einstein. It's pronounced "Eye-n-shtine."

2. IE (The "Eee" Sound) 🥶

When i and e swap places, it sounds like a long "eee" (as in "see").

Liebe (love)
Wien (Vienna)
Sie (you)
Bier (beer) 🍺

3. EU and ÄU (The "Oy" Sound) 🧸

Surprisingly, eu and äu sound like "oy" (as in "toy" or "boy").

Euro (Oy-ro)
Deutschland (Doy-tch-land)
Häuser (Hoy-zer - houses)
Freund (Froy-nd - friend)

4. AU (The "Ow" Sound) 🤕

Pronounce it like "ow" (as in "house" or "mouse").

Haus (house)
Maus (mouse)
blau (blue)

Pattern	Sound	Example (Pronunciation)
ei / ai	Eye	Eis (Ice)
ie	Eee	Knie (Knee)
eu / äu	Oy	Feuer (Foy-er - Fire)
au	Ow	Auto (Ow-to - Car)

5. Minimal Pairs Practice 🥊

The difference between ie and ei changes the meaning completely. Don't mix them up!

Wien (Vienna) vs. Wein (Wine) -> Don't drink the city!
bieten (to offer) vs. beissen (to bite) -> Be careful at business meetings.
Lied (Song) vs. Leid (Suffering) -> A sad mistake.

6. The Rare "UI" 🐷

You won't see this often, but it sounds like "oo-ee".

Pfui! (Yuck/Eww!) - Used for bad smells or bad dogs.