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Online guitar tuner

Stomp the switch, allow the microphone and play a string. The needle shows if you're sharp or flat, and the light comes on when you're in tune.

Quick answer

Standard tuning, low to high: E2 82.41 Hz, A2 110.00 Hz, D3 146.83 Hz, G3 196.00 Hz, B3 246.94 Hz, E4 329.63 Hz (A4 = 440 Hz). Play one string, tune up if the needle sits left, down if it sits right.

Needle
- Stomp to start

Strings: tap one to lock onto it, or to hear its note

Stomp the switch to start the microphone.

Guitar string frequencies in standard tuning

Standard tuning frequencies (A4 = 440 Hz, equal temperament)
StringNoteFrequency
6E282.41 Hz
5A2110.00 Hz
4D3146.83 Hz
3G3196.00 Hz
2B3246.94 Hz
1E4329.63 Hz

Each note is a fixed ratio from A4 = 440 Hz in twelve-tone equal temperament: frequency = 440 × 2^((n − 69) ÷ 12), where n is the note's MIDI number. One fret up multiplies the frequency by about 1.0595, and twelve frets doubles it.

Popular alternate tunings

Common guitar tunings, low string to high string
TuningNotesKnown for
StandardE A D G B EAlmost everything; the default for guitar
Half step down (Eb)D# G# C# F# A# D#Hendrix, Stevie Ray Vaughan, Guns N' Roses; easier bends
D standard (full step down)D G C F A DHeavier rock and grunge with a darker sound
C standardC F A# D# G CDoom, stoner rock and heavy metal
B standardB E A D F# BBaritone guitars and modern metal
Drop DD A D G B EOne-finger power chords; grunge and metal
Drop C#C# G# C# F# A# D#Drop D a half step lower; heavy rock
Drop CC G C F A DModern metal and metalcore
Drop BB F# B E G# C#Very heavy riffs on a six string
Drop AA E A D F# BDjent and extreme metal; needs heavy strings
Double drop DD A D G B DNeil Young and folk rock
Open GD G D G B DSlide guitar and Keith Richards style rhythm
Open DD A D F# A DSlide guitar, blues and folk
Open EE B E G# B ESlide guitar; Open D shapes, one step higher
Open AE A E A C# ESlide guitar; Open G shapes, one step higher
Open CC G C G C EBig, resonant acoustic chords
Open D minorD A D F A DMoody fingerstyle and Delta blues
Open G minorD G D G A# DDark slide and folk
DADGADD A D G A DCeltic and folk fingerstyle; open, droning chords
Open C6 (CACGCE)C A C G C EJimmy Page's acoustic sound on Bron-Yr-Aur
All fourths (EADGCF)E A D G C FSame shapes on every string; jazz and tapping
New Standard (CGDAEG)C G D A E GRobert Fripp's tuning in fifths
7-string standardB E A D G B EStandard tuning with a low B added
Bass standard (EADG)E A D GFour-string bass
Bass drop DD A D GBass with the low E dropped to D
5-string bass (BEADG)B E A D GFive-string bass with a low B

Tips for tuning faster

Tuners for every setup

A clip-on works anywhere. A pedal tuner mutes your signal on stage.

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Questions guitarists ask

How do I use this online tuner?
Press the footswitch and allow microphone access. Play one string at a time and let it ring. The tuner finds the nearest string in your tuning. If the needle is left of center, tune up; if it's right, tune down. The red light comes on within 3 cents of perfect.
Is my audio recorded or sent anywhere?
No. The pitch is worked out inside your browser, on your device. No sound is recorded, stored or sent to any server.
Why won't the tuner hear my guitar?
Make sure the browser has microphone permission, and play close to the mic in a quiet room. Pluck firmly and let the note ring. Laptop noise cancellation can mute quiet notes, so try a phone if a laptop struggles.
What are the notes of standard guitar tuning?
E A D G B E, from the thickest string (6th) to the thinnest (1st). With A4 = 440 Hz the low E is 82.41 Hz and the high E is 329.63 Hz.
Can I tune a bass with this?
Yes. Pick bass standard tuning (E A D G). Low bass notes are harder for small phone mics to hear, so play close to the mic or use a harmonic at the 12th fret.
Should I tune to 440 Hz or 432 Hz?
440 Hz is the modern standard and matches nearly every recording and band. You can change the reference if you need to match a piano or a record that's slightly off.

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Last updated November 14, 2026.