Frequency Reference Tool
Complete frequency charts for musical notes, tuning standards, and harmonic analysis. Explore relationships between frequencies and tuning systems.
Display Options
Frequency Table - A440
| Note | C1 | C2 | C3 | C4 | C5 | C6 | C7 | C8 |
|---|---|---|---|---|---|---|---|---|
| C | 32.70 | 65.41 | 130.81 | 261.63 | 523.25 | 1046.50 | 2093.00 | 4186.01 |
| C# | 34.65 | 69.30 | 138.59 | 277.18 | 554.37 | 1108.73 | 2217.46 | 4434.92 |
| D | 36.71 | 73.42 | 146.83 | 293.66 | 587.33 | 1174.66 | 2349.32 | 4698.64 |
| D# | 38.89 | 77.78 | 155.56 | 311.13 | 622.25 | 1244.51 | 2489.02 | 4978.03 |
| E | 41.20 | 82.41 | 164.81 | 329.63 | 659.26 | 1318.51 | 2637.02 | 5274.04 |
| F | 43.65 | 87.31 | 174.61 | 349.23 | 698.46 | 1396.91 | 2793.83 | 5587.65 |
| F# | 46.25 | 92.50 | 185.00 | 369.99 | 739.99 | 1479.98 | 2959.96 | 5919.91 |
| G | 49.00 | 98.00 | 196.00 | 392.00 | 783.99 | 1567.98 | 3135.96 | 6271.93 |
| G# | 51.91 | 103.83 | 207.65 | 415.30 | 830.61 | 1661.22 | 3322.44 | 6644.88 |
| A | 55.00 | 110.00 | 220.00 | 440.00 | 880.00 | 1760.00 | 3520.00 | 7040.00 |
| A# | 58.27 | 116.54 | 233.08 | 466.16 | 932.33 | 1864.66 | 3729.31 | 7458.62 |
| B | 61.74 | 123.47 | 246.94 | 493.88 | 987.77 | 1975.53 | 3951.07 | 7902.13 |
Tip: Hover over frequency values to see full note information including MIDI numbers.
A4 (440Hz Reference)
Middle C (C4)
Understanding Frequencies
Equal Temperament
Modern tuning system where the octave is divided into 12 equal semitones, each representing a frequency ratio of 2^(1/12) ≈ 1.059463.
MIDI Notes
MIDI notes range from 0-127 (full spec), but this tool focuses on the practical musical range A0-C8 (MIDI 21-108). Middle C (C4) = 60 and A4 = 69 (440Hz reference).
Harmonic Series
Natural overtones that occur at integer multiples of a fundamental frequency. Important for understanding timbre and acoustic instruments.