Standard tuning uses the notes E, A, D, G, B, and E
Standard guitar tuning is E–A–D–G–B–E, starting from the thickest string (the low E string) and moving to the thinnest (the high E string). This means your lowest string vibrates at the pitch of E, your next string at A, then D, then G, then B, and your highest string at E again — one octave higher than the lowest.
This tuning has been the default for acoustic and electric guitars for over a century because it balances playability across the fretboard with the ability to play chords and melodies in most musical keys. The spacing between the notes creates intervals that work well for both fingerpicking and strumming patterns.
You can hear what standard tuning sounds like by searching "standard guitar tuning" on YouTube — many videos play each string individually so you can hear the exact pitch. A tuner (either a clip-on device, a pedal, or a smartphone app) will show you which string is which note and whether it is sharp or flat.
Key Takeaways
- Standard tuning spells E–A–D–G–B–E from the thickest string to the thinnest, with the two E strings one octave apart.
- This tuning is standard because the interval spacing makes common chords and scales accessible without extreme finger stretching.
- You can verify your tuning by ear using reference videos, or by using a tuner app or clip-on device that shows you the exact note on each string.
- If your strings are tuned to the right notes but sound too high or too low overall, your guitar may need a setup adjustment rather than retuning.
Why these six notes instead of others
The intervals between the strings in standard tuning are not all the same. From the low E string upward, you have: E to A (a perfect fourth), A to D (a perfect fourth), D to G (a perfect fourth), G to B (a major third), and B to E (a perfect fourth). That major third between the G and B strings is the exception — it breaks the pattern.
This uneven spacing exists because it solves a real problem: if all the intervals were perfect fourths, the strings would be too far apart for your hand to form basic chords. The major third between G and B keeps the strings close enough together that you can press three or four strings at once without your fingers colliding. It also means that open chords (chords played without moving your fingers up the neck) sound natural and balanced.
Guitarists have experimented with other tunings for centuries — drop D, open G, DADGAD, and dozens more — but standard tuning remains the default because it works for folk, rock, blues, country, jazz, and classical music without requiring you to retune between songs.
How to check if your guitar is in standard tuning
The simplest method is to use a digital tuner. Clip-on tuners cost $10 to $30 and attach to your headstock; they measure the vibration of each string and display the note name on a small screen. Tune each string one at a time, starting with the low E string, and adjust the tuning pegs until the tuner shows the correct note.
If you do not have a tuner, you can use a tuner app on your phone — search "guitar tuner" in your app store and choose one with good reviews. Hold your phone near the string you are tuning and pluck it; the app will show you whether the note is sharp (too high), flat (too low), or in tune.
A third option is to tune by ear using a reference. Play a video of standard tuning on YouTube or Spotify, listen to each string, and adjust your tuning pegs until your strings match the pitch. This takes practice but works in a pinch if you have no tuner or phone available.
What happens if your guitar is tuned to a different key
If your guitar is tuned to a different key — say, D–G–C–F–A–D instead of E–A–D–G–B–E — the chords and melodies you play will sound lower or higher than they should, but the relationships between the strings stay the same. A chord shape that normally produces a major chord will still produce a major chord; it will just be in a different key.
Some musicians intentionally tune to non-standard keys for specific songs or to create a particular sound. Drop D tuning (lowering only the low E string to D) is common in rock and metal. Open tunings (where the open strings form a chord without pressing any frets) are used in blues and folk music. But these are deliberate choices, not mistakes.
If your guitar sounds consistently lower or higher than it should but the tuner says all the strings are in tune, the problem is usually not the tuning itself. It may be that your guitar needs a setup — an adjustment to the neck, bridge, or nut by a technician — or that you are comparing it to a recording in a different key.
Tuning pegs and how to adjust them
Each string has a tuning peg (also called a tuning machine or tuning key) at the headstock. Turning the peg clockwise or counterclockwise winds or unwinds the string, raising or lowering its pitch. The direction varies depending on which side of the headstock the peg is on — on most guitars, the three pegs on the left side turn one direction and the three on the right turn the opposite direction.
Turn the peg slowly while plucking the string and watching your tuner. Stop when the tuner shows the correct note. If you turn too far, the string will go sharp (too high) or flat (too low), and you will need to adjust again. New strings go out of tune quickly, so expect to retune several times in the first few days after changing strings.
If a tuning peg is hard to turn or feels loose, the guitar may need maintenance. A loose peg can slip during playing, throwing your tuning off. A stiff peg may need lubrication. Either way, a guitar technician can fix it.
How often to check your tuning
Check your tuning before every practice session or performance. Temperature changes, humidity, and the natural stretching of strings all cause tuning to drift. A guitar left in a cold car will go flat; one left in the sun may go sharp. New strings take several days to stabilize, so you may need to retune multiple times per day for the first week.
If your guitar goes out of tune very quickly — within minutes of tuning — the problem is usually worn tuning pegs, a loose bridge, or old strings. Replacing the strings is the first step; if that does not help, have a technician inspect the tuning pegs and bridge.
Frequently Asked Questions
Can I tune my guitar to a different key if I want?
Yes. You can tune to any key you choose — drop D, open G, or any other combination. The chord shapes and finger positions will work the same way, but the pitches will be different. Many songs use non-standard tunings by design, so this is a normal part of playing guitar.
What if I tune by ear and it sounds right to me but a tuner says it is wrong?
Trust the tuner. Your ear can be fooled by room acoustics, background noise, or habit. A tuner measures the actual frequency of the string and is always accurate. Over time, tuning by ear becomes easier, but a tuner is the reliable reference.
Do acoustic and electric guitars use the same standard tuning?
Yes. Both use E–A–D–G–B–E. The only difference is that electric guitars often use lighter strings, which require less finger pressure. The tuning itself is identical.
Why does my guitar sound out of tune even though the tuner says it is in tune?
This usually means the guitar needs a setup — an adjustment to the neck, bridge, or nut. It can also happen if you are comparing your guitar to a recording in a different key. Have a technician check the intonation (whether the frets are in the right positions) if the problem persists.
How do I know which tuning peg controls which string?
Each tuning peg is connected to one string by a post at the headstock. Turn a peg slowly and watch which string winds or unwinds. Once you know which peg controls which string, tuning becomes straightforward.