Use the free tool above, then read on for how it works, a worked example, and practical tips.
What this tool does
Reading Morse from a chart is easy, but recognising it by ear is the real skill, and it only comes from listening again and again. This trainer plays one random letter or digit as sound, you type what you heard, and it keeps your score, so every short session gives you honest feedback on your progress.
How it works
The trainer uses the standard Morse alphabet, with a dit lasting 1200 divided by your words-per-minute speed in milliseconds and a dah three times as long. It plays the tones with the Web Audio API in your browser, so the sound is generated live on your device and no audio files or accounts are needed.
How to use it
- Enter your values in the boxes above.
- Press the calculate or play button.
- Read the result shown below the tool.
- Try a second set of values to compare options.
Worked example
At 15 words per minute a dit lasts 80 milliseconds and a dah lasts 240 milliseconds, so the letter S, three dits, sounds like three short even beeps, while O, three dahs, sounds like three long ones. After a few rounds you will stop counting beeps and start hearing each letter as one shape, which is exactly how fluent operators copy.
Practical tips
Train in short daily sessions of five to ten minutes rather than one long weekend session, and keep the speed low enough that you get most answers right. Add digits only after the letters feel easy, and practise with a comfortable tone pitch, because a harsh tone tires your ears fast.
Common mistakes
The most common mistake is learning Morse by sight and then trying to translate each beep into dots and dashes in your head, which breaks down above about ten words per minute. Another is jumping to high speed too soon, which builds guessing habits instead of real recognition.
Questions and answers
Is this tool free? Yes. It runs in your browser, needs no account, and gives instant results.
Do I need to install anything? No. The tool works on any modern phone or computer browser.
How accurate are the results? The maths follows the standard formulas shown above. Real-world results vary with terrain, equipment, and conditions, so use the figures for planning.
Can I use it on my phone? Yes. The tool is designed to work on a phone screen, so you can use it at the operating desk, in the field, or at a club station without a computer.
Who uses this tool
Radio amateurs, students, and club members all use tools like this one, because they turn a formula from a book into an answer for your own station in seconds. Beginners use it to check homework and first setups, while experienced operators use it to sanity-check a plan before spending money on cable, masts, or antennas. Even a quick check can prevent a costly mistake, such as ordering the wrong cable length or aiming a beam in the wrong direction.
What to try next
- Run the tool with your real station values, not just the default numbers, so the answer means something for your setup.
- Change one input at a time and watch how the result moves, because that shows you which input matters most.
- Write the result in your station notebook next to the date, so you can compare later changes against a known baseline.
Safety note: this is an educational estimator only. Real transmissions need an amateur licence and must follow your local regulations, band plans, and power limits. Never transmit without the proper licence, and treat every result here as a planning guide, not professional or legal advice.
Versión en español: Entrenador de Audio de Código Morse – Aprende CW de Oído con un Quiz con Puntuación
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