Divide BPM by 60 to get the primary unit of frequency, the Hertz. Multiply the result by the correct power of 10 to get the relevant multiple of the Hertz. For example, you'll multiply by 10^(-3) to get the answer in Kilohertz instead of Hertz. You'll multiply by 10^3 to get the answer in Millihertz.
Multiply BPM by 6 to get angular velocity in degrees per second. Multiply the result by 60 to get degrees per minute, or by 3,600 to get degrees per hour. To get an answer in radians,, multiply by 6.28 to convert from BPM to radians per minute.
Convert BPM directly to RPM for rotational speed. The ratio is 1:1. Multiply by 0.02 to get cycles per second.