I like to use this sometimes :

When you play a fast arp, lfo (or retrig on other lachines), or 32th with scale 2x, you can have a note depending on tempo.

A = 440 Hz. 440 x 60 = 26 400
Divide by 2 until you get common tempo :
A > 103.125 bpm

To find tempo one semi-tone above, you have to multiply by 2^(1/12)=1,0594630944

That number can be used to find frequencies too, starting from 440 Hz. Ex with 5 semi tones above :
440 (A4) x 2^(1/12)^5 = 587.3 (D5)