Teacher2Teacher 
Q&A #1864 
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From: Loyd To: Teacher2Teacher Public Discussion Date: 2002040521:56:26 Subject: Piano notes The octave on a piano is misnamed because all the keys are equal as far as frequency is concerned. The A above middle C is 440 Hz. The next key, (be it black or white) is 440 x 2^(1/12)=466.16 and the next is the last key times x 2^(1/12 and so forth. 2^(1/12)=1.059463094 so one can use that factor to find successive notes. The key before A above middle C would be 440/(2^(1/12)). The scientific calculator is great for this since it permits raising a number to a fractional power. By the way, there are 12 spaces in an octave and all are 1/12 octave apart. One counts the spaces, not the keys.
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