F in Morse Code
The letter F in Morse code is ..-.: two dots, a dash, then a dot, sounded “di-di-dah-dit”. The dash sits third in the pattern, which gives F a distinctive skip in its rhythm.
What Does F Look Like in Morse Code?
F has 4 signals (3 dots and 1 dash) and takes 9 timing units to send. F is one of the letters beginners often mix with L, because both use the same four signals in a different order. See it next to every other letter on the Morse code alphabet chart.
Words That Start With F in Morse Code
| Word | Morse code | Letters |
|---|---|---|
| FOR | ..-. --- .-. | F O R |
| FUN | ..-. ..- -. | F U N |
| FIVE | ..-. .. ...- . | F I V E |
| FAST | ..-. .- ... - | F A S T |
| FIRE | ..-. .. .-. . | F I R E |
Each word starts with ..-.. A space separates the letters. Type any other word into the Morse code translator to hear it.
Letters Easily Confused With F
L (the mirror of F)
.-.. · dot dash dot dot
U (F without the last dot)
..- · di-di-dah
V (dash at the end)
...- · three dots then a dash
I N (two letters)
.. -. · same signals with a letter gap
F, U and V all open with dots and then a dash. With F, a final dot follows the dash. Spacing matters too: ..-. is F, but .. -. with a gap is the word IN. For a step-by-step method, read how to identify a letter from its Morse pattern.
How to Remember F in Morse Code
Say it out loud
“Di-di-dah-dit” has two quick sounds, one long, then one quick. The long sound in third place is the giveaway.
Think of U plus a dot
F is U (..-) with one extra dot at the end. If you already know U, F is one step away.
Learn it with L
Reverse F and you get L (.-..). Practise the pair together so you stop confusing them.
Drill it
Hear F next to L, U and V in the Morse code practice quiz.
How Long Does F Take to Send?
F is 9 units long: 1 for each of the three dots, 3 for the dash, and 1 for each of the three gaps inside the letter. A dot is 1 unit and a dash is 3. The Morse code timing guide explains how speed changes the length of a unit.
| Speed | One unit | Time to send |
|---|---|---|
| 5 WPM | 240 ms | 2160 ms |
| 10 WPM | 120 ms | 1080 ms |
| 15 WPM | 80 ms | 720 ms |
| 20 WPM | 60 ms | 540 ms |
| 25 WPM | 48 ms | 432 ms |
F in Radio and Real-World Morse
FB: fine business
FB (..-. -...) means “fine business”, radio slang for great or excellent. See more on the Morse code abbreviations page.
FER: for
Operators often shorten “for” to FER (..-. . .-.), as in TNX FER CALL, meaning thanks for the call.
Foxtrot in the NATO alphabet
On voice radio, F is spoken “Foxtrot”. Morse code vs the NATO alphabet explains the difference.
F in ham radio
Short words like FB and FER make ham radio Morse contacts quicker to send.
How Efficient Is F in Morse Code?
Alfred Vail gave common letters short codes after estimating how often each letter is used. Comparing F’s share of English text with the length of its code shows how well that plan worked for this letter.
| Measure | F |
|---|---|
| Share of letters in English text | 2.2% |
| Frequency rank (of 26 letters) | 16th |
| Morse code length | 9 units |
| Other letters with the same length | B, G, K, L, V, W |
| American Morse (US landline telegraph) | .-. (the same as International R) |
F is the sixteenth most common letter and takes 9 units. In American Morse, F was dot-dash-dot, which is R in International Morse, one of several letters that changed meaning between the two codes.
Frequently Asked Questions
What is F in Morse code?
F in Morse code is ..-.: dot, dot, dash, dot.
How do you say F in Morse code out loud?
F is spoken “di-di-dah-dit”: two short sounds, one long sound, then one short sound.
What letter is dot dot dash dot in Morse code?
Dot dot dash dot (..-.) is the letter F. Dot dash dot dot (.-..) is L.
What is the difference between F and L in Morse code?
They are mirror images. F is ..-. and L is .-... In F the dash comes third; in L it comes second.
What does FB mean in Morse code?
FB means “fine business”, radio slang for great or excellent. It is sent as ..-. -....