Octave Band Frequencies
The octave and the 1/3 octave band frequencies.
The audible frequency range can be separated into unequal segments called octaves.
An octave higher is a doubling of the octave band frequency. Octave bands can be separated into three ranges  referred to as onethirdoctave bands.
Octave Bands
listen to the sound!  touch and click the frequency below!  

Lower Band Limit (Hz)  Center Frequency (Hz)  Upper Band Limit (Hz) 
11  16  22 
22  31.5  44 
44  63  88 
88  125  177 
177  250  355 
355  500  710 
710  1000  1420 
1420  2000  2840 
2840  4000  5680 
5680  8000  11360 
11360  16000  22720 
The "onethirdoctaves" have been standardized for scientific instruments commonly used for tasks like to determine NCcriterion and similar.
Third Octave Bands
listen to the sound!  touch and click the frequency below!  

Lower Band Limit (Hz)  Center Frequency (Hz)  Upper Band Limit (Hz) 
11.2  12.5  14.1 
14.1  16  17.8 
17.8  20  22.4 
22.4  25  28.2 
28.2  31.5  35.5 
35.5  40  44.7 
44.7  50  56.2 
56.2  63  70.8 
70.8  80  89.1 
89.1  100  112 
112  125  141 
141  160  178 
178  200  224 
224  250  282 
282  315  355 
355  400  447 
447  500  562 
562  630  708 
708  800  891 
891  1000  1122 
1122  1250  1413 
1413  1600  1778 
1778  2000  2239 
2239  2500  2818 
2818  3150  3548 
3548  4000  4467 
4467  5000  5623 
5623  6300  7079 
7079  8000  8913 
8913  10000  11220 
11220  12500  14130 
14130  16000  17780 
17780  20000  22390 
Wavelength
The wavelength depends on the speed of sound and can be calculated as
λ = c / f (2)
where
λ = wavelength (m)
c = speed of sound (m/s)
f = frequency (s^{1}_{,} Hz)
Sound velocity depends on the density of the air and the air temperature. Typical value for speed of sound is 343 m/s for temperature 20^{o}C.
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