Why 4 is interesting
Four has no standard cut-number alias — operators simply send the full four-dot-dash pattern even in contest exchanges. It’s the penultimate step before the all-dot 5.
Cultural and numerical context
Four is four dots, one dash — the last before the full-dot 5.
How to remember 4 in morse
“Almost all dots” — four taps and then one trailing dash, like a knock-knock-knock-knock-DOOR. Of the 1-through-5 group, 4 is the last one before you reach the all-dots completeness of 5; remember 4 as “5 minus its last dot replaced with a dash.”
Where you’ll hear 4 in real morse traffic
Four shows up in maritime emergency channels (channel 16 VHF is “one-six,” but secondary channel 4 is sometimes used for ship-to-ship), in time-zone offsets (“UTC minus four” for Eastern Daylight Time), in band-edge frequencies (“the 40-meter band”), and in QSL card mailing addresses where 4-digit street numbers are common.
NATO & aviation phonetic for 4
“Four” in NATO. Aviation uses “fower” (sometimes spelled “fower-er”) — adding a syllable on the end so the word doesn’t get cut off in transmission and confused with “for.”
Practice tip for drilling 4
Because 4 has no cut-number alias, you can’t shortcut your way around it — drill the full pattern. The rhythm to internalize is “four short pulses, then one long”: di-di-di-di-DAH. It’s the only digit with a 4-to-1 ratio, which gives it a distinct ear-print once you’ve heard it a few hundred times.
How long 4 takes to send
Four 1-unit dits, one 3-unit dah, four gaps: 11 units, tied with its mirror 6 as the second-lightest digit in morse. Push the speed to 30 WPM (40 ms per unit) and the whole character clears in 440 ms. Because so much of 4 is dits, it compresses beautifully at high speed — the challenge isn’t its length but counting four fast taps accurately.
4 and 6, the lightest mirror pair
Backwards, ....- reads -.... — the digit 6. They’re the lightest of the four mirror pairs at 11 units each, and the pair most often fumbled in copy practice because the single dah hides at opposite ends of a blur of dots. The fix is rhythmic, not arithmetic: 4 ends on the long tone, 6 opens with it.
All ten digits at a glance
See the full numbers explainer for why every digit is five elements, or the alphabet for letter codes.
Frequently asked questions
What is the number 4 in morse code?
The digit 4 in international morse code is "....-" — a five-element pattern like every other digit.
How long does 4 take to send in morse?
4 (....-) is 4 dits and 1 dah, which with inter-element gaps totals 11 timing units — 660 ms at 20 WPM. Digits range from 9 units (5) to 19 units (0).