NATO Phonetic Alphabet Translator

How it works

On the phone, B and P, M and N, or F and S are easy to mishear when you spell a surname, a postcode or a booking reference. This tool pairs every letter with its NATO code word, which people in airlines, hotels, banks and support lines are trained to recognise. "K7Q2X" becomes Kilo, Seven, Quebec, Two, X-ray. Digits use the ICAO radio forms where they differ from plain English: 3 is Tree, 4 Fower, 5 Fife and 9 Niner. Letters with accents such as é or ñ have no NATO word; the tool spells the plain letter and says so in the summary line, so you know to mention the accent separately. If you paste code words such as "Sierra Oscar Sierra" instead, the tool recognises them and gives back SOS; both Alfa and Alpha, Juliett and Juliet, X-ray and Xray are understood.

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What is NATO phonetic alphabet?

The NATO phonetic alphabet assigns a distinct code word to each letter from A to Z so that spelling survives a bad phone line or radio noise: Alfa, Bravo, Charlie through Zulu. Its formal name is the ICAO radiotelephony spelling alphabet. It replaced older lists such as Able, Baker, Charlie in the 1950s and is now used in aviation, shipping, the armed forces, the police and call centres worldwide.

What is ICAO?

ICAO, the International Civil Aviation Organization, is the United Nations agency that sets the rules for international air travel. Its Annex 10 on aeronautical telecommunications defines the spelling alphabet and the radio pronunciation of digits. Because pilots and controllers of every nationality must understand each other, the list was tested with speakers of many languages before it was adopted.

NATO alphabet vs Morse code: what is the difference?

The NATO alphabet is for saying letters out loud: on the phone or radio you say "Sierra" instead of "S" and the listener cannot mishear it. Morse code turns letters into short and long signals (dots and dashes) sent as sound, light or electrical pulses, and the receiver has to decode them. SOS is ··· ––– ··· in Morse and Sierra Oscar Sierra in the NATO alphabet. For Morse, use the Morse Code Translator on this site.

The catch: made-up words confuse more than they help

Many people improvise on the phone: "A as in apple, B as in boy". It works until the listener mishears the example word itself, or the word starts with a silent letter ("K as in knife"). The NATO words were chosen after listening tests with speakers of 31 nationalities so that each one stays clear through a bad line and a strong accent.

Watch the official spellings, which are deliberate: Alfa rather than Alpha and Juliett rather than Juliet, because "ph" and a single final "t" are pronounced differently in other languages. Spoken, the difference is small; written in a radio log or a script, use the ICAO forms.

When to use which layout

Choose by how you will use the result:

• Reading out on a call → side by side, one word after another
• Checking a long code letter by letter → one letter per line
• Postcodes and plates with digits → the radio digit forms (Tree, Fife, Niner) avoid confusion
• Aviation, sailing and amateur radio → NATO/ICAO is the standard
• Written messages and email → no spelling alphabet needed, copy and paste the code

Frequently asked questions

Is the NATO alphabet the same as the ICAO alphabet?

Yes. The official name is the ICAO radiotelephony spelling alphabet, defined in Annex 10 to the Convention on International Civil Aviation. NATO adopted the same list, which is why most people call it the NATO alphabet. The International Telecommunication Union uses it too.

Why is nine said as "niner"?

ICAO changed the pronunciation of a few digits so they survive radio noise: Tree for three, Fower for four, Fife for five and Niner for nine. Niner has an extra syllable so it cannot be confused with the German "nein" (no).

How do I spell a letter with an accent?

The NATO alphabet covers only A–Z. The tool spells the plain letter (é as Echo) and lists the replaced letters in the summary line; on a call, add "with an accent" after the word.

Is what I type sent anywhere?

No. The spelling happens in your browser; names, postcodes and booking codes never leave your device.