: What is 3 decades down from 220 Hz?
:: = 0.22 Hz
: What is 1.5 decades up from 10 Hz?
:: ? 316.23 Hz

To find out the size of a step for a certain number of frequencies per decade, raise 10 to the power of the inverse of the number of steps:
: What is the step size for 30 steps per decade?
:: ? 1.079775 - or each step is 7.9775% larger than the last.

Graphical representation and analysis

1, 10, 100, 1k, 10k, 100k using decades vs. 0, 10, 20, 30, 40, 50 using linear scaleDecades

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