Frequency of different notes in hertz (vibrations per second)
  Octave*
Note -4 -3 -2 -1 0 1
A 27.5 55 110.0 220.0 440.0 880.0
A# 29.1 58.3 116.5 233.1 466.2 932.3
B 30.9 61.7 123.5 246.9 493.9 987.8
C 32.7 65.4 130.8 261.6 523.3 1046.5
C# 34.6 69.3 138.6 277.2 554.4 1108.7
D 36.7 73.4 146.8 293.7 587.3 1174.7
D# 38.9 77.8 155.6 311.1 622.3 1244.5
E 41.2 82.4 164.8 329.6 659.3 1318.5
F 43.7 87.3 174.6 349.2 698.5 1396.9
F# 46.2 92.5 185.0 370.0 740.0 1480.0
G 49.0 98.0 196.0 392.0 784.0 1568.0
G# 51.9 103.8 207.7 415.3 830.6 1661.2
A 55.0 110.0 220.0 440.0 880.0 1760.0
             
             
*0 codes for the octave containing middle C; -1 the octave below; +1 the octave above; etc.