Tuning a guitar takes about five minutes once you know the process. The easiest way is to use a microphone-based tuner like guitartuner.dev, which detects pitch in real time and shows you exactly how flat or sharp each string is. This guide walks through every step from opening the tuner to doing a final check.
What you need
Just two things: a guitar and a browser on any device. The tuner works on desktop computers, laptops, iPhones, and Android phones — no app download or account required.
Step 1: Open the tuner
Go to guitartuner.dev in your browser and allow microphone access when the prompt appears. The tuner starts listening immediately. You do not need to press any button to begin — simply play a string and the tuner will respond.
Step 2: Start with the low E string
Play the thickest string — string 6, the low E. The tuner automatically detects which note you are playing and displays the note name and how many cents flat or sharp it is. You do not need to tell it which string you are tuning; it figures this out from the pitch.
Step 3: Read the needle
The needle (or indicator) shows whether you are flat, in tune, or sharp:
- Needle to the left (flat) — the string is too low. Tune up by turning the tuning peg. On most guitars, turning the peg away from you raises the pitch of the string.
- Needle at centre (in tune) — the string is correctly tuned. The display typically turns green.
- Needle to the right (sharp) — the string is too high. Tune down by turning the peg toward you.
Always aim to approach the target pitch from below (tuning up to pitch) rather than overshooting and tuning back down. This gives the tuning peg a consistent direction of tension and helps the string stay in tune longer.
Step 4: Work up the strings
Tune the strings in order: E (6th), A (5th), D (4th), G (3rd), B (2nd), e (1st). Working from low to high is efficient because the thicker lower strings anchor most of the neck tension. Play each string individually and let it ring clearly while reading the tuner.
Step 5: Do a second pass
After tuning all six strings, go back and check the low E again. When you tighten the higher strings, the increased tension on the neck causes the lower strings to shift slightly flat. A quick second pass — usually just small tweaks — gets everything precisely in tune together.
Standard guitar tuning reference
| String | Note | Octave | Frequency |
|---|---|---|---|
| 6 (low E) | E | 2 | 82.41 Hz |
| 5 (A) | A | 2 | 110.00 Hz |
| 4 (D) | D | 3 | 146.83 Hz |
| 3 (G) | G | 3 | 196.00 Hz |
| 2 (B) | B | 3 | 246.94 Hz |
| 1 (high e) | E | 4 | 329.63 Hz |
Tuning tips for beginners
- Always tune up to pitch, never down to it. Approaching the target from below gives you more precise control and helps the peg hold tension.
- Tune in a quiet environment. Background noise interferes with microphone pitch detection. Even a TV across the room can cause inaccurate readings.
- Change old strings before a gig or recording session. Worn strings lose their ability to intonate correctly and go out of tune more quickly.
- Check tuning before playing every time. Guitars go out of tune due to temperature changes, humidity, and simply being moved. Checking takes seconds and makes a big difference.
How to tune without a tuner (relative tuning)
If you need to tune without a reference device, you can use the 5th fret method. Fret the 6th string at the 5th fret to get the same pitch as the open 5th string (A). Then fret the 5th string at the 5th fret to match the open 4th string (D), and so on. The exception is the B string — fret the G string at the 4th fret (not the 5th) to match the open B string.
This method tunes the strings relative to each other but does not guarantee you are in concert pitch. For any situation involving other musicians or recordings, use the tuner at guitartuner.dev to get accurate absolute pitch.
Frequently asked questions
How often should I tune my guitar?
Before every playing session. Temperature changes, humidity, and playing itself all cause strings to drift from pitch. A quick check before you start takes under a minute.
Why does my guitar go out of tune so quickly?
New strings need stretching. Old strings lose elasticity. Cheap tuning pegs can slip. Try a different string brand, stretch new strings manually after installation, or have a guitar technician check the nut slots and tuning machine quality.
What order should I tune guitar strings?
Low E first (6th string), then A, D, G, B, high e — then do a second pass on the low E. Alternatively, use the tuner and simply play whichever string sounds most out of tune first.
Can I tune a guitar by ear?
Yes, using the 5th fret relative tuning method, but a tuner is more accurate and faster. Use guitartuner.dev for precise concert pitch tuning, especially when playing with other musicians.
What does it mean when a guitar is a half step down?
Every string is lowered by one semitone: Eb Ab Db Gb Bb Eb. Select Half Step Down from the tuning selector on guitartuner.dev to use this tuning. See the alternate tunings guide for full details.