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Revolutions per minute (rpm) measures rotational speed, expressing how many complete turns an object makes in one minute. It is the most common unit for engine speed, hard drive spin rates, and power tool specifications worldwide. One rpm equals exactly 1/60 hertz or approximately 0.01667 Hz.

The megahertz (MHz) equals one million hertz, widely used for radio frequency bands, early CPU clock speeds, and wireless communication standards. FM radio broadcasts in the 88–108 MHz range, while early personal computers operated at just a few MHz. One megahertz equals 1,000,000 cycles per second.