Pitch & Frequency Reference
Complete reference table of musical notes and their frequencies. All 128 MIDI notes from C0 to G10 with Hz values and play buttons. Click any note to hear it played.
| Note | Octave | Frequency (Hz) | MIDI | Play |
|---|---|---|---|---|
| C | 3 | 130.813 | 48 | |
| C# | 3 | 138.591 | 49 | |
| D | 3 | 146.832 | 50 | |
| D# | 3 | 155.563 | 51 | |
| E | 3 | 164.814 | 52 | |
| F | 3 | 174.614 | 53 | |
| F# | 3 | 184.997 | 54 | |
| G | 3 | 195.998 | 55 | |
| G# | 3 | 207.652 | 56 | |
| A | 3 | 220.000 | 57 | |
| A# | 3 | 233.082 | 58 | |
| B | 3 | 246.942 | 59 | |
| C | 4 | 261.626 | 60 | |
| C# | 4 | 277.183 | 61 | |
| D | 4 | 293.665 | 62 | |
| D# | 4 | 311.127 | 63 | |
| E | 4 | 329.628 | 64 | |
| F | 4 | 349.228 | 65 | |
| F# | 4 | 369.994 | 66 | |
| G | 4 | 391.995 | 67 | |
| G# | 4 | 415.305 | 68 | |
| A | 4 | 440.000 | 69 | |
| A# | 4 | 466.164 | 70 | |
| B | 4 | 493.883 | 71 |
How to Use This Reference
Choose an Octave Range
Select the octave group at the top. The middle range (C4–B5) covers most guitar and vocal ranges.
Search or Browse
Type a note name like "A4" or a frequency like "440" to filter the table.
Play Any Note
Click ▶ on any row to hear that exact pitch played through your speakers for 1.2 seconds.
Why Use This Tool
All 128 MIDI Notes
Every note from C-1 (8.18 Hz) to G9 (12,543 Hz) with exact frequencies to 3 decimal places.
Hear Every Pitch
Play any note through a pure sine wave oscillator directly in your browser. Great for ear training.
Adjustable Reference A
Change A4 from 440 Hz and all frequencies recalculate instantly — useful for historical or non-standard pitch standards.
MIDI Numbers Included
Shows the MIDI note number alongside each note — useful for producers, programmers, and DAW users.
Frequently Asked Questions
What is A4 = 440 Hz?
A4 is the A above middle C, and 440 Hz is the international standard reference pitch agreed upon in 1939. All other notes are derived from this.
What is middle C?
Middle C is C4 (MIDI note 60) with a frequency of 261.626 Hz at A=440. It sits at the center of a piano keyboard.
Why do some instruments use A=442?
Many European orchestras and some jazz ensembles use A=442 Hz for a slightly brighter sound. Use the reference A input to recalculate all frequencies for your pitch standard.
What is a MIDI note number?
MIDI encodes pitches as integers from 0–127. Middle C (C4) is MIDI 60, A4 is MIDI 69. Each step is one semitone.