Press Play for A at 440 Hz, then pick a note or tuning pitch by name: an A440 tone generator.
A 440 Tone Generator: 440 Hz sine tone
Start with your device volume low.
Sine wave · both channels
Hz
Period 2.27 ms
Wavelength 78 cm (30.7 in)
The note A4
Ready. It starts quiet and fades in over half a second.
A steady tone can harm ears and speakers before it sounds loud. Hear nothing? Do not turn it up to find the tone: small speakers cannot play very low tones, and many adults cannot hear very high ones.
Percent of this tool's loudest. Your device volume does the rest.
This A 440 tone generator opens on concert pitch, the A above middle C, so the first press is a 440 Hz tone generator. Under it is a musical note tone generator: pitches, notes and open strings, one press each.
Read the full guide
How to use a 440 Hz tone to tune
Press Play and leave the A sounding. Play your own A against it and listen for a slow pulsing: two close notes beat at the difference of their frequencies, so 442 Hz against 440 pulses twice a second. The pulsing slows as you get nearer and stops when the notes match.
A tuning tone generator for guitar, violin and band
The list has the six strings of a guitar, the four of a violin and the B flat a concert band tunes to. The twelve notes make it a C tone generator, an E tone generator or an A flat tone generator in one press.
The big number takes two decimals, so an A of 441 or 439.5 Hz is a typed number away.
÷2 and ×2 move any note down or up one octave: the 440 Hz A becomes 220 or 880 Hz.
Questions and answers
Can I use it as a 432 Hz tone generator?
Yes. Press A at 432 Hz, below the standard. It is about a third of a semitone under 440 Hz. Both are pitches for tuning: the page is a test signal, not a treatment or a hearing test, and it claims nothing for either number.
Is there a B flat tone generator for band tuning?
Yes. Press Concert band B flat for 466.16 Hz, the B flat above middle C. Concert bands usually tune to a B flat where orchestras tune to an A.
Does it work as a drone tone generator?
For one note, yes. Press a row, then Play, and the note sounds until you press Stop, steady enough to play or sing against. It plays one tone at a time, so it cannot hold a chord.
Is this an ear training tone generator?
It gives the answer first: you pick a named note and hear it. To be asked instead, try the perfect pitch test, which plays a note and has you name it.
All 29 notes
Concert pitch: A at 440 Hz and its rivals 7
Concert A, the 440 standardThe A above middle C at 440 Hz, the pitch standard ISO 16 and the note this page opens on. Most orchestras take their A from the oboe before they play.
Baroque pitch, A at 415Many ensembles that play baroque music have agreed on 415 Hz. It is the standard A dropped by one semitone, 415.30 Hz, and rounded to a whole number.
Classical pitch, A at 430Among players of period instruments, classical pitch is an A of 427 to 430 Hz. At 430 Hz it is 40 cents, two fifths of a semitone, under the standard.
A at 432 Hz, below the standard32 cents, about a third of a semitone, under 440 Hz. A French tuning fork of 1822 gave this A. The page plays it as a pitch and says nothing more for it.
French pitch of 1859, A at 435France set the A above middle C at 435 Hz by law on February 16, 1859, the first standard on that scale, known as the diapason normal. It is 20 cents under 440 Hz.
A at 442 Hz, a little over standard8 cents over 440 Hz. In 1964, 19 of 31 leading orchestras in the United States tuned to 440 Hz and the others to 441 or 442.
A at 444 Hz, top of the usual orchestra range16 cents over 440 Hz. In continental Europe an orchestra's A commonly lies between 440 and 444 Hz.
Show all 29 notes (22 more)
The twelve notes from middle C 11
C, the middle one on a piano (C4)261.63 Hz, nine semitones under the 440 Hz A. Each semitone down divides the frequency by the twelfth root of two, about 1.0595.
C sharp above middle C277.18 Hz, also written D flat. Eight semitones under A at 440 Hz.
D above middle C293.66 Hz, seven semitones under A, which puts the two a fifth apart. A violin has a string tuned to this note.
E flat above middle C311.13 Hz, also written D sharp. Six semitones under A is half an octave, so this is 440 divided by the square root of two.
E above middle C329.63 Hz, five semitones under A. The first, thinnest string of a guitar in standard tuning sounds this note.
F above middle C349.23 Hz. F and the A over it are four semitones apart, a major third.
F sharp above middle C369.99 Hz, also written G flat. Three semitones under A, a minor third.
G above middle C392 Hz, two semitones under A, and one octave over the 196 Hz G that a violin and a guitar each have a string for.
A flat above middle C415.30 Hz, also written G sharp, one semitone under A. Baroque pitch rounds this figure down to 415 Hz and calls it A.
B flat above middle C466.16 Hz, also written A sharp, one semitone over the 440 Hz A.
B above middle C493.88 Hz, two semitones over A and one under the next C, 523.25 Hz.
Tuning notes by instrument 11
Guitar low E, sixth and thickest82.41 Hz, the sixth string and the lowest note of standard tuning. The strings rise by a fourth each time, except for one step.
Guitar A, the fifth of six110 Hz: two octaves under the 440 Hz A, so the two can be checked against each other.
Guitar D, the fourth of six146.83 Hz, a fourth over the A string.
Guitar G, the third of six196 Hz, a fourth over the D string. The step to the next string is the odd one: a major third.
Guitar B, the second of six246.94 Hz, a major third over the G string and a fourth under the top E.
Guitar high E, first and thinnest329.63 Hz, two octaves over the sixth string and the same pitch as the E above middle C.
Violin G, the lowest of the four196 Hz, the G below middle C and the lowest note of a violin tuned the usual way.
Violin D, a fifth under its A293.66 Hz. A violin tunes in fifths: G, D, A and E.
Violin A, tuned firstThe A string is tuned to the reference first, usually 440 Hz, and the other three strings are then tuned from it.
Violin E, the highest of the four659.26 Hz in equal temperament. Violinists tune their fifths until they stop beating, and a pure fifth over 440 Hz is 660 Hz, a hair above this figure.
Concert band B flatConcert bands usually tune to a B flat where orchestras tune to an A. This row plays the B flat above middle C, 466.16 Hz, a note also written A sharp.
How this list was compiled: List written for this page; every tone is made in the visitor's browser by this page's own tone generator. Note frequencies are computed, not looked up: equal temperament from A = 440 Hz, each semitone a factor of the twelfth root of two, rounded to two decimal places; the guitar figures agree with the table at https://en.wikipedia.org/wiki/Guitar_tunings. Cents are computed as 1,200 times the base-2 logarithm of the frequency ratio, and 660 Hz is 440 times three halves. Checked on 2026-10-02 against Wikipedia: https://en.wikipedia.org/wiki/A440_(pitch_standard) (440 Hz as the tuning standard for the A above middle C, ISO 16; a modern baroque pitch of 415 Hz and a classical pitch of 427 to 430 Hz among players of period instruments; an A of 440 to 444 Hz in continental Europe); https://en.wikipedia.org/wiki/Concert_pitch (the French law of February 16, 1859 setting 435 Hz, the diapason normal; a French tuning fork of 1822 at 432 Hz; many baroque ensembles at 415 Hz, a semitone under 440 Hz rounded to a whole number; in 1964, 19 of 31 leading United States orchestras at 440 Hz and the others at 441 or 442; most orchestras tune to a note given by the oboe); https://en.wikipedia.org/wiki/Guitar_tunings and https://en.wikipedia.org/wiki/Standard_tuning (the six strings E, A, D, G, B, E in fourths with one major third between G and B); https://en.wikipedia.org/wiki/Violin (tuned in fifths to G, D, A and E; G below middle C is its lowest note; the A string is tuned first, usually to 440 Hz); https://en.wikipedia.org/wiki/Musical_tuning (orchestras usually tune to an A and concert bands to a B flat; violins are tuned to beatless fifths); https://en.wikipedia.org/wiki/Beat_(acoustics) (two close tones beat at the difference of their frequencies, and the beating slows as they approach unison). The source gives no octave for the band's B flat; the row plays the one above middle C and says so. Wikipedia's text is under CC BY-SA 4.0; the facts were checked there and the wording is this site's own. Licence: own work