Morse code is a signalling system that turns every letter, number and punctuation mark into a pattern of short signals (dots) and long signals (dashes). To read it, you match each pattern to a character using a chart, then use the length of the gaps to tell where letters and words end. Below are the full International Morse chart, the timing rules, and a practical way to learn it by ear.
What Morse code is and where it came from
Samuel Morse and his collaborator Alfred Vail developed the code in the late 1830s to send messages over the electric telegraph. The famous first public message, “What hath God wrought,” went from Washington to Baltimore on May 24, 1844.
That original system is now called American Morse code. Europe adopted a cleaner version based on Friedrich Gerke’s 1848 revision, and it became International Morse code at the 1865 International Telegraph Conference in Paris. Today the International Telecommunication Union maintains the standard in Recommendation ITU-R M.1677-1.
The design is clever. Common letters got the shortest codes, so E is a single dot and T is a single dash. The usual account is that Vail estimated letter frequency by counting the type in a printer’s case.
Morse code chart: the alphabet
All 26 letters in International Morse code. A dot is . and a dash is -.
| Letter | Code | Letter | 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 and punctuation
Numbers are the easiest group. Each has five elements, and the pattern shifts by one position as you count.
| Number | Code | Number | Code |
|---|---|---|---|
| 1 | .---- |
6 | -.... |
| 2 | ..--- |
7 | --... |
| 3 | ...-- |
8 | ---.. |
| 4 | ....- |
9 | ----. |
| 5 | ..... |
0 | ----- |
These punctuation marks appear in the ITU standard. The @ sign was added in 2004, the first new character in decades.
| Mark | Code | Mark | Code |
|---|---|---|---|
| Full stop (.) | .-.-.- |
Hyphen (-) | -....- |
| Comma (,) | --..-- |
Slash (/) | -..-. |
| Question mark (?) | ..--.. |
Left bracket ( ( ) | -.--. |
| Apostrophe (‘) | .----. |
Right bracket ( ) ) | -.--.- |
| Colon (:) | ---... |
Quotation mark (“) | .-..-. |
| Equals / break (=) | -...- |
Plus (+) | .-.-. |
| At sign (@) | .--.-. |
Error | ........ |
You will see the exclamation mark written as -.-.-- on many charts. It is widely used but sits outside the ITU list.
The timing rules that make Morse code work
Morse is a rhythm system. Everything is measured in one unit, the length of a dot.
| Element | Length |
|---|---|
| Dot | 1 unit |
| Dash | 3 units |
| Gap inside a letter | 1 unit |
| Gap between letters | 3 units |
| Gap between words | 7 units |
Without these gaps, a string like ...... could be “HI,” “IH,” “EEEEEE” or several other things. Spacing is how you solve that ambiguity.
Speed is measured in words per minute (WPM) using the standard word PARIS, which is exactly 50 units long. To find the unit length in milliseconds, divide 1200 by the WPM. At 20 WPM, each dot lasts 60 milliseconds.
Usage tip
When you write Morse on paper or type it into a translator, put one space between letters and a slash (/) between words. For example, “HI YOU” becomes .... .. / -.-- --- ..-.
How to read Morse code step by step
- Split by words. Find the slashes or the long seven-unit pauses.
- Split by letters. Inside each word, look for the three-unit gaps.
- Look up each pattern. Match it against the chart above.
- Check odd results. A string of nonsense usually means a missed letter gap.
Try this example: -- --- .-. ... . / -.-. --- -.. .
Break it apart and you get M, O, R, S, E, then C, O, D, E. The message is “MORSE CODE.”
Examples to try
Decode these yourself before checking the answers.
... --- ...: SOS.... . .-.. .-.. ---: HELLO-.-. --.-: CQ (a radio call meaning “calling any station”).-- --- .-. -.. ...: WORDS
A fun drill is to encode 5 letter words from a Wordle list. They are short enough to hold in your head and long enough to practise letter spacing.
Learning by ear: the method that works
Reading a chart is fine for puzzles. To copy Morse at real speed, you need to hear each letter as a single sound, a habit operators describe as learning the rhythm of a character.
Two methods dominate amateur radio training:
- Koch method. Start with two letters at full speed, often 20 WPM. Add a new letter once you copy 90% correctly.
- Farnsworth timing. Send each character at full speed but stretch the gaps between them. This gives your brain time to think without teaching slow, broken rhythms.
Use an audio generator or practice app that plays characters aloud. Ten or fifteen minutes a day beats an hour on the weekend.
Often confused with
American Morse code uses different patterns and internal spaces (O is . . and C is .. .). Unless a source says otherwise, assume International Morse.
Common mistakes
- Counting dots and dashes visually. This creates a lookup delay that caps you at very slow speeds.
- Ignoring spacing. Most decoding errors come from merging two letters into one.
- Learning with mnemonics. Picture tricks help for a day, then slow you down.
- Confusing similar letters. Watch pairs like
..-.(F) and.-..(L), or-..(D) and-...(B).
Prosigns and SOS
Prosigns are procedural signals sent as one run with no letter gaps. SOS is the best known: ...---.... It was adopted at the 1906 Berlin Radiotelegraph Convention and took effect in 1908. It was chosen for its distinctive rhythm and stands for nothing.
| Prosign | Code | Meaning |
|---|---|---|
| SOS | ...---... |
Distress |
| AR | .-.-. |
End of message |
| SK | ...-.- |
End of contact |
| K | -.- |
Go ahead, over |
| BT | -...- |
Break or new paragraph |
Is Morse code still used?
Yes, though in narrower roles. Ships stopped relying on Morse for distress calls when the Global Maritime Distress and Safety System took over in 1999. In the US, the FCC dropped the Morse requirement for amateur radio licences in 2007.
Even so, Morse remains popular with radio amateurs because a weak CW (continuous wave) signal can get through when voice fails. Aviation navigation beacons still identify themselves in Morse. It also helps people with severe motor disabilities type using a single switch.
FAQ
What is the fastest way to learn Morse code?
Learn by sound using the Koch or Farnsworth method, with daily short practice sessions. Most learners can copy the full alphabet slowly within a few weeks.
What does a slash mean in written Morse code?
A slash separates words. A single space separates letters within a word.
Does SOS stand for “save our souls”?
No. That phrase came later. SOS was chosen because its three dots, three dashes and three dots are easy to send and hard to mistake.
How fast do experienced operators send Morse code?
Many working amateur operators are comfortable around 20 to 30 WPM. Competition speeds run far higher.
Is there a Morse code for lowercase letters?
No. Morse code has no case, so “A” and “a” share the same pattern.
About this article
- Fact-checked by Maureen Talbot against the sources listed below before publication.
- Published
Sources (8)
- Friedrich Clemens Gerke (en.wikipedia.org)
- loc.gov
- International Radiotelegraph Convention (1906) (en.wikipedia.org)
- Learn morse code (upliftorch.com)
- sciencedirect.com
- Morse code (en.wikipedia.org)
- Best way to learn morse code (learnmorsy.com)
- Morse code wpm speed (morsecodetranslation.net)