Note Frequency Chart
Every note in Hz, plus an Hz-to-note converter — A4 reference adjustable.
Hz to note: find the note for any frequency
Type any frequency into the box above and it returns the nearest note, that note's exact pitch, and how far off you are in cents. The maths is n = 69 + 12 × log₂(f ÷ 440), the inverse of the formula used for the chart below.
| Frequency (Hz) | Nearest note | Exact pitch of that note (Hz) | Difference (cents) |
|---|---|---|---|
| 60 | B1 | 61.74 | -49.4 |
| 64 | C2 | 65.41 | -37.6 |
| 90 | F#2 | 92.50 | -47.4 |
| 100 | G2 | 98.00 | +35.0 |
| 120 | B2 | 123.47 | -49.4 |
| 160 | D#3 | 155.56 | +48.7 |
| 200 | G3 | 196.00 | +35.0 |
| 250 | B3 | 246.94 | +21.3 |
| 400 | G4 | 392.00 | +35.0 |
| 440 | A4 | 440.00 | +0.0 |
| 480 | B4 | 493.88 | -49.4 |
| 1000 | B5 | 987.77 | +21.3 |
Complete note frequency chart — all octaves
Every standard musical note from C0 at 16.35 Hz to B8 at 7902.13 Hz, with its MIDI note number and the wavelength of that frequency in air at 20 °C, where sound travels at 343 m/s. Click any row to hear the note as a sine wave.
| Note | Frequency (Hz) | MIDI | Wavelength (m) |
|---|---|---|---|
| C0 | 16.35 | 12 | 20.977 |
| C#0 | 17.32 | 13 | 19.799 |
| D0 | 18.35 | 14 | 18.688 |
| D#0 | 19.45 | 15 | 17.639 |
| E0 | 20.60 | 16 | 16.649 |
| F0 | 21.83 | 17 | 15.715 |
| F#0 | 23.12 | 18 | 14.833 |
| G0 | 24.50 | 19 | 14.000 |
| G#0 | 25.96 | 20 | 13.214 |
| A0 | 27.50 | 21 | 12.473 |
| A#0 | 29.14 | 22 | 11.773 |
| B0 | 30.87 | 23 | 11.112 |
| C1 | 32.70 | 24 | 10.488 |
| C#1 | 34.65 | 25 | 9.900 |
| D1 | 36.71 | 26 | 9.344 |
| D#1 | 38.89 | 27 | 8.820 |
| E1 | 41.20 | 28 | 8.325 |
| F1 | 43.65 | 29 | 7.857 |
| F#1 | 46.25 | 30 | 7.416 |
| G1 | 49.00 | 31 | 7.000 |
| G#1 | 51.91 | 32 | 6.607 |
| A1 | 55.00 | 33 | 6.236 |
| A#1 | 58.27 | 34 | 5.886 |
| B1 | 61.74 | 35 | 5.556 |
| C2 | 65.41 | 36 | 5.244 |
| C#2 | 69.30 | 37 | 4.950 |
| D2 | 73.42 | 38 | 4.672 |
| D#2 | 77.78 | 39 | 4.410 |
| E2 | 82.41 | 40 | 4.162 |
| F2 | 87.31 | 41 | 3.929 |
| F#2 | 92.50 | 42 | 3.708 |
| G2 | 98.00 | 43 | 3.500 |
| G#2 | 103.83 | 44 | 3.304 |
| A2 | 110.00 | 45 | 3.118 |
| A#2 | 116.54 | 46 | 2.943 |
| B2 | 123.47 | 47 | 2.778 |
| C3 | 130.81 | 48 | 2.622 |
| C#3 | 138.59 | 49 | 2.475 |
| D3 | 146.83 | 50 | 2.336 |
| D#3 | 155.56 | 51 | 2.205 |
| E3 | 164.81 | 52 | 2.081 |
| F3 | 174.61 | 53 | 1.964 |
| F#3 | 185.00 | 54 | 1.854 |
| G3 | 196.00 | 55 | 1.750 |
| G#3 | 207.65 | 56 | 1.652 |
| A3 | 220.00 | 57 | 1.559 |
| A#3 | 233.08 | 58 | 1.472 |
| B3 | 246.94 | 59 | 1.389 |
| C4 | 261.63 | 60 | 1.311 |
| C#4 | 277.18 | 61 | 1.237 |
| D4 | 293.66 | 62 | 1.168 |
| D#4 | 311.13 | 63 | 1.102 |
| E4 | 329.63 | 64 | 1.041 |
| F4 | 349.23 | 65 | 0.982 |
| F#4 | 369.99 | 66 | 0.927 |
| G4 | 392.00 | 67 | 0.875 |
| G#4 | 415.30 | 68 | 0.826 |
| A4 | 440.00 | 69 | 0.780 |
| A#4 | 466.16 | 70 | 0.736 |
| B4 | 493.88 | 71 | 0.694 |
| C5 | 523.25 | 72 | 0.656 |
| C#5 | 554.37 | 73 | 0.619 |
| D5 | 587.33 | 74 | 0.584 |
| D#5 | 622.25 | 75 | 0.551 |
| E5 | 659.26 | 76 | 0.520 |
| F5 | 698.46 | 77 | 0.491 |
| F#5 | 739.99 | 78 | 0.464 |
| G5 | 783.99 | 79 | 0.438 |
| G#5 | 830.61 | 80 | 0.413 |
| A5 | 880.00 | 81 | 0.390 |
| A#5 | 932.33 | 82 | 0.368 |
| B5 | 987.77 | 83 | 0.347 |
| C6 | 1046.50 | 84 | 0.328 |
| C#6 | 1108.73 | 85 | 0.309 |
| D6 | 1174.66 | 86 | 0.292 |
| D#6 | 1244.51 | 87 | 0.276 |
| E6 | 1318.51 | 88 | 0.260 |
| F6 | 1396.91 | 89 | 0.246 |
| F#6 | 1479.98 | 90 | 0.232 |
| G6 | 1567.98 | 91 | 0.219 |
| G#6 | 1661.22 | 92 | 0.206 |
| A6 | 1760.00 | 93 | 0.195 |
| A#6 | 1864.66 | 94 | 0.184 |
| B6 | 1975.53 | 95 | 0.174 |
| C7 | 2093.00 | 96 | 0.164 |
| C#7 | 2217.46 | 97 | 0.155 |
| D7 | 2349.32 | 98 | 0.146 |
| D#7 | 2489.02 | 99 | 0.138 |
| E7 | 2637.02 | 100 | 0.130 |
| F7 | 2793.83 | 101 | 0.123 |
| F#7 | 2959.96 | 102 | 0.116 |
| G7 | 3135.96 | 103 | 0.109 |
| G#7 | 3322.44 | 104 | 0.103 |
| A7 | 3520.00 | 105 | 0.097 |
| A#7 | 3729.31 | 106 | 0.092 |
| B7 | 3951.07 | 107 | 0.087 |
| C8 | 4186.01 | 108 | 0.082 |
| C#8 | 4434.92 | 109 | 0.077 |
| D8 | 4698.64 | 110 | 0.073 |
| D#8 | 4978.03 | 111 | 0.069 |
| E8 | 5274.04 | 112 | 0.065 |
| F8 | 5587.65 | 113 | 0.061 |
| F#8 | 5919.91 | 114 | 0.058 |
| G8 | 6271.93 | 115 | 0.055 |
| G#8 | 6644.88 | 116 | 0.052 |
| A8 | 7040.00 | 117 | 0.049 |
| A#8 | 7458.62 | 118 | 0.046 |
| B8 | 7902.13 | 119 | 0.043 |
Changing the reference pitch
A4 = 440 Hz is the international standard, but it is not the only one in use. Many orchestras tune to 442 Hz, and early-music ensembles often play at 415 Hz, a semitone below modern pitch. Change the A4 reference above and every frequency in the chart is recalculated from it.
To check what your own instrument is actually producing, open the guitar tuner or the piano tuner, which read the same numbers from your microphone in real time.
Frequently asked questions
What is the frequency range of human hearing?
Most adults hear from roughly 20 Hz to 20 000 Hz, and the upper limit falls with age. Musical instruments span a narrower band: the lowest note on a standard piano is A0 at 27.50 Hz and the highest is C8 at 4186.01 Hz.
Why do note frequencies double every octave?
Doubling the frequency produces a pitch we hear as the same note one octave higher, because hearing responds to frequency ratios rather than absolute differences. A3 is 220 Hz, A4 is 440 Hz, A5 is 880 Hz. The twelve semitones inside an octave are evenly spaced on a logarithmic scale, each a factor of the twelfth root of two, about 1.059463, apart.
How many hertz is middle C?
Middle C is C4, which is 261.63 Hz in equal temperament with A4 at 440 Hz. It is MIDI note 60.
What note is 400 Hz?
400 Hz falls between G4 at 391.995 Hz and G#4 at 415.305 Hz. The nearest note is G4, and 400 Hz is about 35 cents above it — roughly a third of a semitone sharp.
How do I convert a frequency in Hz back to a note?
Use the formula n = 69 + 12 × log2(f / 440), which gives the MIDI note number. Round it to the nearest whole number for the note name, and multiply the leftover fraction by 100 to get the deviation in cents. The Hz to note box at the top of this page does exactly that.
How note frequencies work: the octave and semitone pattern
Note frequencies follow two simple rules. Going up one octave doubles the frequency. Going up one semitone multiplies it by about 1.05946. At the standard A4 = 440 Hz, that gives A5 = 880 Hz and A#4 = 466.16 Hz.
The same note across octaves
| Note | Frequency (Hz) | Calculation |
|---|---|---|
| A2 | 110 | 220 ÷ 2 |
| A3 | 220 | 440 ÷ 2 |
| A4 | 440 | reference |
| A5 | 880 | 440 × 2 |
| A6 | 1760 | 880 × 2 |
This works for every note. E4 is 329.63 Hz, so E5 is 659.26 Hz and E3 is 164.81 Hz. If you remember one octave, you can work out the others by doubling or halving.
Using the tool with this pattern
- Check the octave. If a frequency you measured seems too high or too low, halve or double it and look for the result in the chart. Click that row to hear the note.
- Read the cents. Type 445 into the Hz to note box. It is closest to A4, and the difference is about +19.6 cents, so it is sharp of 440 Hz. Use Play this frequency to hear how it sounds against the chart's A4.
- Match your ensemble's tuning. Some groups tune A4 to 442 Hz. Change the A4 reference and the whole chart recalculates: A3 becomes 221 Hz and A5 becomes 884 Hz. That is about 7.9 cents higher than 440 Hz.
- Compare two notes. Divide the higher frequency by the lower one. A result near 2 means an octave. A result near 1.05946 means one semitone.
Low notes have long wavelengths, and high notes have short ones. That is why the wavelength column shrinks by half with each octave, from 1.559 m at A3 to 0.780 m at A4.
Why does a note's frequency double every octave?
An octave is defined as a 2:1 ratio between two frequencies. That is why A4 at 440 Hz is followed by A5 at 880 Hz, and A3 sits at 220 Hz. Each octave is split into 12 equal semitones, so each semitone multiplies the frequency by about 1.05946.