Morse Code Alphabet: Complete A–Z Chart, Numbers & How to Use It
Morse code is one of the most enduring communication systems ever invented. Nearly two centuries after its creation, it still appears in ham radio transmissions, aviation beacons, and accessibility tools. This guide covers the complete alphabet, numbers, punctuation, and a brief look at why Morse has lasted so long.
A Brief History
In the 1830s, American artist and inventor Samuel Morse partnered with physicist Joseph Henry and machinist Alfred Vail to develop an electrical telegraph system. The code they devised — officially called International Morse Code after its 1865 standardization — assigned short signals (dots) and long signals (dashes) to each letter of the alphabet. On 24 May 1844, Morse sent the first long-distance telegraph message from Washington D.C. to Baltimore: "What hath God wrought."
The original American Morse Code differed slightly from the International version used today. The International standard was adopted by the ITU and remains the global reference.
How Morse Code Works
Morse uses just two signals — a short mark called a dot (·) and a long mark called a dash (−). The timing rules define everything:
- A dash is 3× the duration of a dot.
- The gap between signals within a letter = 1 dot length.
- The gap between letters = 3 dot lengths.
- The gap between words = 7 dot lengths.
These timing ratios mean Morse can be sent at any speed — a skilled operator can transmit over 30 words per minute, while a beginner might start at 5 wpm.
Complete A–Z Alphabet
| Letter | Morse Code | Letter | Morse Code |
|---|---|---|---|
| A | · − | N | − · |
| B | − · · · | O | − − − |
| C | − · − · | P | · − − · |
| D | − · · | Q | − − · − |
| E | · | R | · − · |
| F | · · − · | S | · · · |
| G | − − · | T | − |
| H | · · · · | U | · · − |
| I | · · | V | · · · − |
| J | · − − − | W | · − − |
| K | − · − | X | − · · − |
| L | · − · · | Y | − · − − |
| M | − − | Z | − − · · |
Numbers 0–9
| Digit | Morse Code |
|---|---|
| 0 | − − − − − |
| 1 | · − − − − |
| 2 | · · − − − |
| 3 | · · · − − |
| 4 | · · · · − |
| 5 | · · · · · |
| 6 | − · · · · |
| 7 | − − · · · |
| 8 | − − − · · |
| 9 | − − − − · |
Common Punctuation
| Symbol | Morse Code |
|---|---|
| . (period) | · − · − · − |
| , (comma) | − − · · − − |
| ? (question mark) | · · − − · · |
| ! (exclamation) | − · − · − − |
| / (slash) | − · · − · |
| @ (at sign) | · − − · − · |
| = (equals) | − · · · − |
SOS — The Most Famous Morse Sequence
The international distress signal SOS is sent as · · · − − − · · · (three dots, three dashes, three dots) without any letter gaps — it is transmitted as a single continuous prosign. It was chosen in 1906 precisely because it is easy to recognize: a distinct pattern that stands out from ordinary traffic. SOS does not stand for "Save Our Ship" or "Save Our Souls" — those backronyms came later. The letters were simply chosen for their memorability in Morse.
Where Morse Code is Still Used Today
- Amateur (ham) radio — the FCC no longer requires a Morse test to obtain a US amateur licence, but many operators still use CW (continuous wave Morse) because it cuts through noise better than voice at low power levels.
- Aviation — VOR navigation beacons and Non-Directional Beacons (NDB) transmit their three-letter identifier in Morse so pilots can confirm they are tuned to the correct station.
- Military and emergency communications — Morse remains a backup communication method in scenarios where voice or digital links fail.
- Accessibility — people with limited motor control can input Morse via a single switch to type text. iOS and Android both support Morse input as an accessibility keyboard option.
- Hobbyist and cultural uses — Morse tattoos, jewellery, puzzle design, and escape rooms have given the code a popular-culture second life.
Want to translate text to Morse and hear the audio? Try the DevBench Morse Code Translator — it converts in both directions and plays back the dots and dashes.
Try it yourself
Use the free browser-based Morse Code Translator on DevBench — no signup, runs entirely in your browser.
Open Morse Code Translator