Convert Megahertz to RPM

About converting Megahertz to RPM

Megahertz (MHz) and RPM (rpm) are both units of frequency, so converting between them is a single multiplication: multiply your Megahertz figure by 59,999,999.88. Ten Megahertz comes to 599,999,998.8 RPM, and a hundred works out at 5,999,999,988 RPM.

Rule of thumb: going from Megahertz to RPM multiplies, so the figure always grows — one Megahertz is already 59,999,999.88 RPM. If your answer came out smaller, you have the conversion the wrong way round.

What is a Megahertz?

The megahertz covers FM radio — the two-digit numbers on an FM dial are megahertz — along with broadcast television, walkie-talkies and a great deal of the spectrum in between. It is also the unit that once sold computers: through the 1980s and 1990s a processor’s megahertz figure was the headline specification, and buyers treated it as a direct measure of speed. That was always shaky, because how much work a chip does per cycle varies enormously between designs, and the assumption became known as the megahertz myth once rival architectures started beating faster-clocked ones.

What is a RPM?

RPM measures rotation rather than waves, but a revolution is a cycle like any other, which is what puts it in the same family as the hertz. It is the number on a car’s tachometer, where an engine idles low and a redline marks the point past which the valvetrain will not keep up. It rated hard drives for decades — 5,400 and 7,200 rpm were the two grades of consumer drive, and the faster platter genuinely meant quicker access, a distinction SSDs made irrelevant. It is also the spin-cycle figure on a washing machine, where more rpm means drier clothes and more noise.

To put both in perspective: an FM station broadcasts at around 100 megahertz, while a car engine idles at around 800 rpm.

The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the RPM to Megahertz converter, or browse all Frequency converters.