International Phonetic Alphabet: What It Is and How It Works

The International Phonetic Alphabet (IPA) is a system of symbols that gives every speech sound its own unique character, so you can write down exactly how a word is pronounced in any language. Unlike normal spelling, each IPA symbol stands for one sound only. For example, the English word cat is written /kæt/, and that transcription means the same thing to any trained reader anywhere in the world.

On this page

1. What Is the International Phonetic Alphabet?
2. Why the International Phonetic Alphabet Exists
3. A Short History of the IPA
4. How the International Phonetic Alphabet Works
5. International Phonetic Alphabet Examples
6. The IPA in Dictionaries and Learning
7. International Phonetic Alphabet vs NATO Phonetic Alphabet
8. How to Start Learning the IPA
9. Final Thoughts
10. Frequently Asked Questions

What Is the International Phonetic Alphabet?

At its core, the International Phonetic Alphabet is a tool for writing speech. It covers consonants, vowels, stress, length, tone and many small details of pronunciation. Because it aims to describe all human languages, it includes sounds that English never uses, such as the clicks of some African languages or the throat sounds of Arabic.

The symbols are usually displayed on a single page called the IPA chart. That chart arranges consonants by where and how they are made, and it places vowels on a diagram of the mouth. As a result, the layout itself teaches you a lot about how speech works.

The alphabet belongs to no single country or language. Instead, the International Phonetic Association, a scholarly body of phoneticians and teachers, looks after it and publishes the official chart on the International Phonetic Association website.

Why the International Phonetic Alphabet Exists

Ordinary spelling is a poor guide to pronunciation. English is a famous example. The letter a has different values in cat, car, cake and about. Meanwhile, one sound can have many spellings: the vowel in see also appears in sea, key, piece and receive.

Other languages have the same problem in different ways. French has many silent letters, and the letter j is pronounced differently in English, Spanish, German and French. So if you want to tell someone exactly how to say a word, spelling alone will not work.

The IPA solves this with one simple rule: one symbol, one sound. Therefore /ʃ/ always means the “sh” sound, whether you are writing English ship, French chat or German Schule. In addition, the system is precise enough to record differences between accents and even between individual speakers.

A Short History of the IPA

The International Phonetic Alphabet grew out of language teaching in the late 19th century. In 1886, a group of language teachers in Paris, led by the French linguist Paul Passy, formed an association to promote phonetic methods in the classroom. The group later took the name International Phonetic Association.

The association published its first alphabet a short time later, and most sources date it to 1888. Its founding principles were practical. Symbols should be based on familiar Roman letters where possible, and each distinct sound should get its own symbol. Those ideas still shape the alphabet today.

Over the following century, the alphabet was expanded and revised many times. For example, the British phonetician Daniel Jones developed the “cardinal vowels” in the early 20th century, a set of reference points that still underlies the vowel chart. Later, a major convention held in Kiel, Germany, in 1989 overhauled many symbols. Smaller updates to the chart have followed since then. If you are interested in the other kind of “phonetic alphabet,” our history of the phonetic alphabet covers the radio spelling codes instead.

How the International Phonetic Alphabet Works

Learning the IPA is much easier once you understand a few basic ideas. These ideas apply to every language you might study with it.

Familiar Letters, New Values

Many IPA symbols look like ordinary letters, and several of them sound as you would expect. For instance, /p/, /b/, /m/ and /s/ behave much as they do in English. However, some familiar letters have fixed values that may surprise English readers. The symbol /j/ stands for the “y” sound in yes, not the “j” in jam, and /c/ is a palatal stop rather than a “k” or “s.”

Other symbols are borrowed from Greek or newly designed. Examples include /θ/ (theta) for the “th” in thin, /ð/ (eth) for the “th” in this, /ŋ/ for the “ng” in sing and /ə/, the schwa symbol, for the weak vowel in about. Our IPA symbols page lets you copy any of these characters with one click.

Slashes vs Square Brackets

You will see IPA written inside two kinds of brackets, and the difference matters. Slashes, as in /tɒp/, show a broad or “phonemic” transcription. That means they record only the sounds that change meaning in a language. Square brackets, as in [tʰɒp], show a narrow or “phonetic” transcription with extra detail.

In this example, the raised h marks the small puff of air that English speakers add after /t/ at the start of a stressed syllable. English speakers do not notice it, because it never changes the meaning of a word. Even so, a phonetician may want to record it. Our guide to IPA transcription explains when to use each style.

Phonemes and Allophones

A phoneme is a sound that distinguishes one word from another in a given language. For example, /p/ and /b/ are separate phonemes in English because pin and bin mean different things. An allophone, on the other hand, is a variant of a phoneme that does not change meaning.

A good illustration is the t in American English butter. Many General American speakers pronounce it as a quick tap, written [ɾ], rather than a full [t]. It is still the same phoneme /t/, so the word stays the same. The IPA can capture both levels, which makes it useful for teachers, linguists and speech professionals alike.

Diacritics and Stress Marks

Finally, the IPA uses small marks to fine-tune symbols. A tilde over a vowel shows nasalization, a colon-like mark ː shows length, and a raised stroke ˈ shows which syllable is stressed. So photograph becomes /ˈfəʊtəɡrɑːf/ in British RP and /ˈfoʊtəˌɡɹæf/ in General American.

International Phonetic Alphabet Examples

The table below shows how a few common English words look in IPA. It also highlights the main differences between Received Pronunciation (RP), a traditional British reference accent, and General American (GA).

Word	RP (British)	General American
phonetic	/fəˈnetɪk/	/fəˈnɛtɪk/
water	/ˈwɔːtə/	/ˈwɔtɚ/ or /ˈwɑɾɚ/
thought	/θɔːt/	/θɔt/ or /θɑt/
dance	/dɑːns/	/dæns/
hello	/həˈləʊ/	/həˈloʊ/
measure	/ˈmeʒə/	/ˈmɛʒɚ/

Notice two patterns. First, GA keeps the r sound after vowels, which is why it uses r-colored vowels such as /ɚ/. Second, British dictionaries traditionally write the vowel of dress as /e/, while American sources often use /ɛ/; both describe a similar sound. For the full set of English sounds, see our English IPA chart with 44 sounds.

The IPA in Dictionaries and Learning

Many major learner’s dictionaries print pronunciations in IPA. British publishers in particular have long used it, and dictionaries aimed at English learners usually do too. Online references such as Wiktionary and Wikipedia also give IPA for many words and place names.

Some American dictionaries, by contrast, use their own respelling systems with ordinary letters and accent marks. Those systems are easier to read at a glance. However, each one is different, so the IPA remains the only truly universal option.

Beyond dictionaries, the alphabet is a daily tool for many professions. Linguists use it to document languages. Speech and language therapists use it to record a client’s pronunciation. Singers use it to sing in languages they do not speak, and actors use it to learn accents. Language learners, finally, use it to check pronunciation without relying on a recording.

International Phonetic Alphabet vs NATO Phonetic Alphabet

The word “phonetic” causes a lot of confusion here. The NATO phonetic alphabet is a spelling alphabet. It gives a code word to each letter so that people can spell names and codes clearly over radio or a bad phone line. The International Phonetic Alphabet, in contrast, writes sounds.

Feature	International Phonetic Alphabet	NATO phonetic alphabet
Purpose	Records how words are pronounced	Spells letters clearly by voice
Units	Symbols for speech sounds	Code words for letters (Alfa, Bravo, Charlie)
Size	Over 100 symbols plus diacritics	26 letter words plus digits
Main users	Linguists, teachers, learners, therapists	Pilots, military, police, call centers
Example for “cat”	/kæt/	Charlie Alfa Tango

So if you need to spell an email address on a support call, the NATO code is the right tool. If you need to know how to say a word, use the IPA.

How to Start Learning the IPA

You do not need to memorize the whole alphabet at once. Instead, build up in small steps:

1. Learn the symbols for your own accent first, using an English sounds chart or the equivalent for your language.
2. Study consonants by place and manner with our IPA consonant chart.
3. Next, learn the vowel trapezoid with our IPA vowel chart, which is usually the harder part.
4. Practice by transcribing short words, then check them against a dictionary.
5. Set up an IPA keyboard so typing symbols becomes fast.

It also helps to understand the science behind the symbols. Our introduction to phonetics explains how the mouth, throat and ears shape and perceive speech.

Final Thoughts

The International Phonetic Alphabet gives the world a shared way to write pronunciation. Its one-symbol-one-sound rule cuts through the chaos of spelling, while its brackets, diacritics and stress marks let you choose the level of detail you need. Whether you are learning English, studying linguistics or coaching a singer, a little IPA goes a long way. Start with the sounds you already use, and the rest of the chart will soon make sense.