Most guitar tuning mistakes have nothing to do with your ear — they come from bad habits repeated over and over: tightening a string in a hurry, trusting the microphone in a noisy room, or forgetting to double-check. The good news is there are only a few of them, and they're easy to fix. Here are the 7 most common, each with a practical remedy.
In a nutshell: always tune up to the note (never down), pluck with a medium touch, only use a microphone tuner in a quiet room, let new strings settle, and recheck every string at the end, because tuning one changes the tension on the others.
The 7 most common mistakes (with fixes)
1. Tuning in a hurry without letting the string settle
The moment you tighten a string, the tension redistributes along the whole neck, and for the first few seconds the note can still move. If you jump straight to the next string, you'll probably come back to find this one flat.
Fix: once you've centered the note, give the string a couple of firm plucks and let it ring for a moment. If it holds steady, move on; if not, touch it up before going any further.
2. Trusting a microphone tuner in a noisy room
Tuners that listen through a microphone (apps and web tuners) also pick up the TV, voices, and fans: the reading gets unstable or flat-out wrong.
Fix: kill the noise sources and tune in silence. A convenient option is to tune online with EasyGuitarTuner: it's free, needs no install or sign-up, runs on any device with a browser and a microphone, and supports 6-string guitar, 12-string, and ukulele. Precisely because it relies on the microphone, though, it's affected by background noise: in a quiet room the reading is accurate.
3. Not letting new strings settle
A fresh set of strings keeps stretching for the first few days and constantly drifts flat. Tuning it once and expecting it to hold is the classic mistake of anyone who's just changed strings.
Fix: after installing them, gently pull each string up an inch or two and retune; repeat until it stops going flat. It's a topic of its own, which we cover in the guide on why new strings go out of tune.
4. Reaching the note by tuning down instead of up
If you approach the note by loosening the string, you leave play in the tuning machine's gear: one good vibration is all it takes for the string to slip and drift flat shortly after.
Fix: always reach the note by tuning up, meaning by tightening. If you notice you're sharp, drop below the note and come back up until you center it. It's the core principle behind good tuning with a tuner.
5. Plucking too hard while you tune
A violent strum makes the note start slightly sharp, then drop as the vibration settles. You're tuning to a value that changes a second later.
Fix: pluck the open string with medium intensity, the same you'd use when actually playing, and read the value only once the note has settled.
6. Ignoring the instrument's intonation (the octave)
You can have every string perfectly in tune open and still sound off up the neck, if the instrument's intonation is poorly set. That's a problem with the guitar, not with your tuning.
Fix: compare the harmonic at the 12th fret with the fretted note at the same fret: they should match. If they're different, the string length needs adjusting at the bridge (intonation) — a job to do carefully, or one to hand off to a luthier.
7. Not rechecking every string at the end
Every time you tune one string, you change the overall tension on the neck, and the strings you tuned earlier shift slightly. Stopping after the first pass leaves the guitar only "almost" in tune.
Fix: once you've finished the pass from the 6th string to the 1st, go over every string a second time. On guitars with new strings, you'll often need a third.
How to avoid them every time
Almost all of these mistakes disappear with three habits: tune in a quiet room, always come up to the note with a medium touch, and spend a few seconds on a final recheck. Tuning at every session also helps you notice right away when something's off: if you're wondering how often that should be, read how often to tune your guitar.
Final checklist
- Quiet room if you're using a microphone tuner.
- New strings settled by stretching them before tuning.
- Medium touch, not too hard and not too soft.
- Reach the note by tuning up, never down.
- Let each string stabilize before moving to the next.
- Check intonation at the 12th fret if you sound off up the neck.
- Recheck every string at the end, with at least two full passes.