4 in Morse code
The number 4 is dot dot dot dot dash in International Morse code, said “di-di-di-di-dah”. Like every digit it has five elements: 4 dots followed by 1 dash. It lasts 11 units, which is 660 ms at 20 WPM.
Hear 4 at your speed
At 15 WPM, 4 takes 880 ms to send. Flash or vibrate it in the translator
Where 4 fits in the number pattern
All ten digits follow one rule, so learning the pattern teaches you every number. From 1 to 5 the dots grow from the left; from 6 to 0 the dashes do.
4 on a timing ruler
Characters that sound like 4
These are the characters most often copied by mistake for 4, and why.
- 6Same signals in reverse order
- 9Dots and dashes swapped
- =One element different
- 3One element different
- 5One element different
- HOne element shorter
Can you hear the difference?
Listen, then pick the one you heard.
4 at a glance
- Morse code
- ....-
- Sounds like
- di-di-di-di-dah
- Length
- 11 units
- At 20 WPM
- 660 ms
- Cut number
- None in common use
- Koch order
- 34 of 41, then Number 7
Sources: codes from ITU-R M.1677-1, the International Morse code standard. Cut numbers and on-air usage follow common amateur radio practice.