Note Frequency Chart
A comprehensive reference table showing the frequency in Hz and MIDI note number for every musical note from C0 (16.35Hz) to B8 (7902.13Hz). Click any note to hear its tone via Web Audio synthesis. Adjust the A4 reference tuning between 430Hz and 450Hz and watch all frequencies recalculate in real time — useful for historical tuning systems, orchestral tuning, or non-standard reference pitches. Search and filter by note name to quickly find specific frequencies. Shows the equal temperament formula: frequency = 440 × 2^((midiNote - 69) / 12). Essential for audio engineers, instrument builders, synthesizer programmers, and music students.
A4 Reference Tuning
440 HzFormula: freq = 440 × 2(midiNote - 69) / 12
| Note | Frequency (Hz) | MIDI | Play |
|---|---|---|---|
| C0 | 16.35 | 12 | |
| C#0(Db) | 17.32 | 13 | |
| D0 | 18.35 | 14 | |
| D#0(Eb) | 19.45 | 15 | |
| E0 | 20.60 | 16 | |
| F0 | 21.83 | 17 | |
| F#0(Gb) | 23.12 | 18 | |
| G0 | 24.50 | 19 | |
| G#0(Ab) | 25.96 | 20 | |
| A0 | 27.50 | 21 | |
| A#0(Bb) | 29.14 | 22 | |
| B0 | 30.87 | 23 | |
| C1 | 32.70 | 24 | |
| C#1(Db) | 34.65 | 25 | |
| D1 | 36.71 | 26 | |
| D#1(Eb) | 38.89 | 27 | |
| E1 | 41.20 | 28 | |
| F1 | 43.65 | 29 | |
| F#1(Gb) | 46.25 | 30 | |
| G1 | 49.00 | 31 | |
| G#1(Ab) | 51.91 | 32 | |
| A1 | 55.00 | 33 | |
| A#1(Bb) | 58.27 | 34 | |
| B1 | 61.74 | 35 | |
| C2 | 65.41 | 36 | |
| C#2(Db) | 69.30 | 37 | |
| D2 | 73.42 | 38 | |
| D#2(Eb) | 77.78 | 39 | |
| E2 | 82.41 | 40 | |
| F2 | 87.31 | 41 | |
| F#2(Gb) | 92.50 | 42 | |
| G2 | 98.00 | 43 | |
| G#2(Ab) | 103.83 | 44 | |
| A2 | 110.00 | 45 | |
| A#2(Bb) | 116.54 | 46 | |
| B2 | 123.47 | 47 | |
| C3 | 130.81 | 48 | |
| C#3(Db) | 138.59 | 49 | |
| D3 | 146.83 | 50 | |
| D#3(Eb) | 155.56 | 51 | |
| E3 | 164.81 | 52 | |
| F3 | 174.61 | 53 | |
| F#3(Gb) | 185.00 | 54 | |
| G3 | 196.00 | 55 | |
| G#3(Ab) | 207.65 | 56 | |
| A3 | 220.00 | 57 | |
| A#3(Bb) | 233.08 | 58 | |
| B3 | 246.94 | 59 | |
| C4 | 261.63 | 60 | |
| C#4(Db) | 277.18 | 61 | |
| D4 | 293.66 | 62 | |
| D#4(Eb) | 311.13 | 63 | |
| E4 | 329.63 | 64 | |
| F4 | 349.23 | 65 | |
| F#4(Gb) | 369.99 | 66 | |
| G4 | 392.00 | 67 | |
| G#4(Ab) | 415.30 | 68 | |
| A4 | 440.00 | 69 | |
| A#4(Bb) | 466.16 | 70 | |
| B4 | 493.88 | 71 | |
| C5 | 523.25 | 72 | |
| C#5(Db) | 554.37 | 73 | |
| D5 | 587.33 | 74 | |
| D#5(Eb) | 622.25 | 75 | |
| E5 | 659.26 | 76 | |
| F5 | 698.46 | 77 | |
| F#5(Gb) | 739.99 | 78 | |
| G5 | 783.99 | 79 | |
| G#5(Ab) | 830.61 | 80 | |
| A5 | 880.00 | 81 | |
| A#5(Bb) | 932.33 | 82 | |
| B5 | 987.77 | 83 | |
| C6 | 1046.50 | 84 | |
| C#6(Db) | 1108.73 | 85 | |
| D6 | 1174.66 | 86 | |
| D#6(Eb) | 1244.51 | 87 | |
| E6 | 1318.51 | 88 | |
| F6 | 1396.91 | 89 | |
| F#6(Gb) | 1479.98 | 90 | |
| G6 | 1567.98 | 91 | |
| G#6(Ab) | 1661.22 | 92 | |
| A6 | 1760.00 | 93 | |
| A#6(Bb) | 1864.66 | 94 | |
| B6 | 1975.53 | 95 | |
| C7 | 2093.00 | 96 | |
| C#7(Db) | 2217.46 | 97 | |
| D7 | 2349.32 | 98 | |
| D#7(Eb) | 2489.02 | 99 | |
| E7 | 2637.02 | 100 | |
| F7 | 2793.83 | 101 | |
| F#7(Gb) | 2959.96 | 102 | |
| G7 | 3135.96 | 103 | |
| G#7(Ab) | 3322.44 | 104 | |
| A7 | 3520.00 | 105 | |
| A#7(Bb) | 3729.31 | 106 | |
| B7 | 3951.07 | 107 | |
| C8 | 4186.01 | 108 | |
| C#8(Db) | 4434.92 | 109 | |
| D8 | 4698.64 | 110 | |
| D#8(Eb) | 4978.03 | 111 | |
| E8 | 5274.04 | 112 | |
| F8 | 5587.65 | 113 | |
| F#8(Gb) | 5919.91 | 114 | |
| G8 | 6271.93 | 115 | |
| G#8(Ab) | 6644.88 | 116 | |
| A8 | 7040.00 | 117 | |
| A#8(Bb) | 7458.62 | 118 | |
| B8 | 7902.13 | 119 |
Reference
- Standard tuning: A4 = 440 Hz (ISO 16)
- Baroque tuning: A4 = 415 Hz
- Concert pitch varies: 440-443 Hz depending on orchestra
- MIDI note 60 = Middle C (C4) = 261.63 Hz
- Each octave doubles the frequency; each semitone multiplies by 21/12 ≈ 1.0595
How to Use
- 1
Browse the Frequency Table
View all musical notes from C0 (16.35 Hz) to B8 (7902.13 Hz) with their exact frequency in hertz and MIDI note number. Notes are organized by octave for easy scanning.
- 2
Click to Hear a Note
Click any row in the table to play that note as a sine wave through your speakers. This lets you hear what each frequency sounds like and compare notes across octaves.
- 3
Adjust A4 Reference Tuning
Move the A4 tuning slider between 430 Hz and 450 Hz to recalculate every frequency in the chart. Useful for matching alternate tuning standards used by different ensembles.
- 4
Search and Filter
Type a note name like "F#" to filter the table to only show F# across all octaves. Highlight a specific octave row to focus on the register you are working in.
Examples by Niche
Look up the exact frequency of a bass note causing problems in a mix — E2 at 82.41 Hz is a common low-end trouble spot. Apply a notch filter at precisely that frequency.
Reference MIDI note 60 (C4, 261.63 Hz) as middle C when programming oscillator frequencies. Use the chart to convert between note names, MIDI numbers, and Hz values.
Set A4 to 432 Hz and observe how every note shifts lower — C4 drops from 261.63 Hz to 256.87 Hz. Compare the two tuning systems for your acoustic research.
Demonstrate the formula freq = 440 × 2^((midi - 69) / 12) by clicking notes one octave apart — A3 (220 Hz) and A4 (440 Hz) — showing the exact 2:1 frequency ratio.
Frequently Asked Questions
How are note frequencies calculated?
In equal temperament tuning, every frequency is calculated from the formula: freq = 440 × 2^((midiNote - 69) / 12), where 440Hz is the A4 reference and midiNote is the MIDI note number (A4 = 69). Each semitone is a factor of 2^(1/12) ≈ 1.05946 apart, and each octave doubles the frequency. This system divides the octave into 12 equal logarithmic steps.
Why would I change the A4 reference from 440Hz?
While A4 = 440Hz is the modern international standard, many orchestras tune slightly higher (441-443Hz) for a brighter sound. Baroque music historically used A4 = 415Hz (roughly a semitone lower). Some musicians and recording studios prefer 432Hz for its purported warmer quality. Adjusting the reference lets you see correct frequencies for any tuning standard.
What is the range of human hearing in musical notes?
Human hearing spans approximately 20Hz to 20,000Hz. The lowest piano note (A0) is 27.5Hz, and the highest (C8) is 4186Hz. Notes below C1 (32.7Hz) are felt as vibration more than heard as pitch. Notes above C8 are in the ultrasonic range for many adults, especially with age-related hearing loss above 12-14kHz.
What are MIDI note numbers?
MIDI assigns each note a number from 0 to 127. Middle C (C4) is MIDI note 60, A4 is 69. Each semitone increments the number by 1. MIDI note numbers are used universally in digital music production, synthesizers, and DAWs to represent pitch as a single integer value regardless of tuning system.