Morse Code Timing Rules Explained (Dots, Dashes & Gaps)

Morse code looks like just dots and dashes, but the spaces are just as important as the marks. Get the timing wrong and “SOS” can turn into gibberish. Here are the Morse code timing rules, explained simply.

One unit to rule them all

Everything in Morse is measured in a single base unit of time. Change the unit and you change the speed, but the ratios stay the same:

• Dot (dit): 1 unit of tone.
• Dash (dah): 3 units of tone.
• Gap between marks in the same letter: 1 unit of silence.
• Gap between letters: 3 units of silence.
• Gap between words: 7 units of silence.

Why the gaps matter

Consider the letters that share elements. E is a single dot; I is two dots; S is three. The only thing telling them apart in a stream is the length of the gaps around them. A one-unit gap keeps dots inside the same letter; a three-unit gap ends the letter. This is exactly what an audio translator or image translator has to measure to decode correctly.

Speed: words per minute

Morse speed is quoted in words per minute (wpm), based on the standard word “PARIS”, which is exactly 50 units long. At 12 wpm the unit is 100 milliseconds; at 20 wpm it is 60. When you play a message with the translator app, the speed slider simply scales that one unit up or down.

Farnsworth timing

Learners often use “Farnsworth” timing: the individual letters are sent fast, but the gaps between them are stretched. That keeps each letter sounding like its final rhythm while giving your brain time to catch up — a good way to practise before speeding the gaps back up.

Keep the Morse code alphabet chart handy while you learn the rhythms, and remember: it is the ratios, not the absolute speed, that make Morse readable.