How to Tune a Guitar: Complete Guide
Learn four proven methods to tune your guitar with pinpoint accuracy, understand tuning peg directions, and eliminate slipping strings forever.
The Notes of the Guitar: E A D G B E
Guitars are tuned from the 6th string (thickest string closest to your face) down to the 1st string (thinnest string closest to your feet):
🔄 Which Way Do I Turn the Tuning Pegs?
One of the biggest causes of snapped strings for beginners is turning the tuning peg the wrong direction. Peg orientation depends on your headstock style:
3-Per-Side Headstocks
(Standard Acoustic, Les Paul, Classical)
- • Top Pegs (Strings 6, 5, 4): Turn counter-clockwise to raise pitch (sharpen); clockwise to lower pitch (flatten).
- • Bottom Pegs (Strings 3, 2, 1): Turn clockwise to raise pitch (sharpen); counter-clockwise to lower pitch (flatten).
6-In-Line Headstocks
(Fender Stratocaster, Telecaster, Ibanez)
- • All Pegs on Top: Turn counter-clockwise away from you to tighten and raise pitch. Turn clockwise toward you to loosen and lower pitch.
- • Always pluck the string gently with your right hand while turning the peg with your left to hear the pitch change smoothly.
Tuning with AllTuners's Microphone Detection
Our online tuner uses the McLeod Pitch Method (MPM) autocorrelation to measure audio waveform cycles from your microphone in real time:
- Click Start Tuner on the homepage and allow browser microphone access when prompted.
- Pluck an open string firmly once with a guitar pick or your thumb. Let it ring out naturally.
- Watch the meter needle:
- If the needle is to the left (orange/amber): Your string is Flat (♭). Tighten the peg slowly.
- If the needle is to the right (crimson/magenta): Your string is Sharp (♯). Loosen the peg slightly below pitch, then tighten back up.
- When the needle locks in the center (emerald green) within ±3 cents: The string is perfectly in tune!
Tuning by Ear with Reference Pitch (Listening for "Beats")
Tuning by ear is a crucial ear training skill for live gigging musicians:
When two tones sound simultaneously that are very close but not identical (e.g., 110 Hz and 112 Hz), their sound waves collide and create a distinct pulsating acoustic oscillation called phase beating (you will hear a rhythmic "wah-wah-wah" pulse).
As you turn the peg closer to the correct frequency, the pulse slows down ("waaah... waaah..."). When the two pitches match exactly, the pulsation disappears into a smooth, resonant unison.
The 5th Fret Relative Tuning Method
Once your 6th string (Low E) is in tune, you can tune the remaining strings relative to each other without any tuner or phone:
Why the 4th fret exception? Standard guitar tuning is constructed in musical fourths (5 semitones), but uses a major third (4 semitones) between G and B to make common open chord shapes like C major, G major, and E minor physically ergonomic to play with human fingers!
Natural Harmonics Tuning (5th and 7th Fret)
Lightly rest your finger on the string directly over the 5th and 7th fret wires (do not fret down) and pluck:
- • 5th fret harmonic on 6th string matches the 7th fret harmonic on 5th string.
- • 5th fret harmonic on 5th string matches the 7th fret harmonic on 4th string.
- • 5th fret harmonic on 4th string matches the 7th fret harmonic on 3rd string.
- • 7th fret harmonic on 6th string matches the open 2nd B string.
- • 5th fret harmonic on 2nd string matches the 7th fret harmonic on 1st string.
The Golden Rule: Always Tune UP to Pitch
When you loosen a tuning peg (tuning downward), the gear teeth inside the tuning machine back away from each other, leaving microscopic mechanical slack. The moment you strike a hard power chord or bend a string, that slack slips forward, and your string instantly drops flat.
👉 If your string is sharp: Drop it about a half-step below pitch first, stretch the string with your fingers, and then tune UP into the target note so the gear teeth remain locked tight under tension.
🔧 Why Does My Guitar Go Out of Tune? (5 Common Fixes)
1. Nut Slot Friction ("The Ping")
If you hear a sharp "ping" sound while tuning, the string is binding in the plastic/bone nut slot. Rub the tip of a soft graphite pencil (No. 2 / 2B) into the nut slots; graphite acts as a natural dry lubricant.
2. New Strings Haven't Been Stretched
Fresh guitar strings require manual stretching. Gently pull each string upwards 1–2 inches away from the fretboard, tune back up, and repeat 3–4 times until pitch stabilizes.
3. Too Many Peg Winds
Excessive string coils wrapped around the tuning post act like a spring and compress under tension. Aim for 2 to 3 clean, non-overlapping wraps per tuning post.
4. Temperature & Humidity Swings
Wood expands in high humidity (sharpening strings) and shrinks in dry winter air (flattening strings). Keep your instrument stored in a gig bag or case away from direct heat radiators.