Frequencies people look up
Each has its own page: what it is, the note it is nearest, its octaves and harmonics, and a play button.
Reference pitches
- 440 Hz · A4 — the standard tuning pitch
- 432 Hz · A4 −31.8¢ — an alternative tuning pitch
- 442 Hz · A4 +7.9¢ — the orchestral tuning pitch
- 443 Hz · A4 +11.8¢ — a bright orchestral tuning pitch
- 444 Hz · A4 +15.7¢ — a bright tuning pitch
- 435 Hz · A4 −19.8¢ — the French diapason of 1859
- 430 Hz · A4 −39.8¢ — a period tuning pitch
- 415 Hz · A♭4 −1.3¢ — baroque pitch
- 256 Hz · C4 −37.6¢ — the “scientific pitch” middle C
String frequencies
- 82.41 Hz · E2 — the low E string of a guitar
- 110 Hz · A2 — the A string of a guitar
- 146.83 Hz · D3 — the D string of a guitar
- 196 Hz · G3 — the G string of a guitar and a violin
- 246.94 Hz · B3 — the B string of a guitar
- 329.63 Hz · E4 — the high E string of a guitar
- 41.2 Hz · E1 — the low E string of a bass
- 55 Hz · A1 — the A string of a bass
Frequencies with claims attached
Mains and hum
Test tones and hearing
Comparing tuning standards? 432 Hz vs 440 Hz has a blind listening test. Every note’s frequency is in the note frequency chart, and the tone generator plays any of them.
Frequently asked questions
How do I convert a frequency to a note?
Work out how many semitones it is from A4: 12 × log2(frequency ÷ 440). Round that to the nearest whole number to get the note, and the part you rounded away, times 100, is how many cents sharp or flat the frequency is. The converter above does exactly this, at whatever reference pitch you give it.
What is a cent?
A hundredth of a semitone. Twelve hundred cents make an octave. Many listeners notice a difference of about 5 to 10 cents between two notes played one after the other, and less when they sound together, because the two notes beat.
Why is my frequency not exactly a note?
Almost no frequency is. Notes are a grid laid over a continuous range, and a number like 528 or 60 Hz falls somewhere between two of them. A tuner shows the same thing as a needle off centre.