Frequency measures how often something repeats each second, and it shows up in wildly different contexts — from the 60 Hz hum of household AC power to the multi-gigahertz clock speed of a modern CPU. Because engineers, musicians, mechanics, and radio operators each favor a different unit for the same underlying quantity, converting cleanly between hertz, kilohertz, RPM, and radians per second is a routine but easy-to-fumble task.
How the Frequency Converter works
Every frequency unit in this converter reduces to a fixed relationship with hertz (Hz), the SI base unit equal to one cycle per second. Kilohertz, megahertz, and gigahertz are simple decimal multiples — 1 kHz is 1,000 Hz, 1 MHz is 1,000,000 Hz, and 1 GHz is 1,000,000,000 Hz. RPM (revolutions per minute) converts by a factor of 60, since one revolution per second equals 60 revolutions per minute. Angular frequency in radians per second converts by a factor of 2π, because a single full rotation sweeps through 2π radians rather than the single 'cycle' that hertz counts. The calculator converts your input to hertz first, then from hertz to your target unit, so every pairing stays internally consistent.
Inputs and what they mean
Enter a numeric frequency value, then choose the unit you're converting from and the unit you want to convert to. Values must be positive — frequency doesn't have a meaningful negative direction in this context. Small values (a few hertz) are common for mechanical rotation and human-scale rhythms, while values in the megahertz-to-gigahertz range describe radio signals and computer clock speeds. RPM is most familiar for engines and motors; radians per second shows up in physics and engineering formulas involving angular velocity or AC circuit analysis.
Limits and edge cases
This converter performs a pure unit conversion — it does not account for context-specific nuances like a radio station's channel bandwidth, a motor's load-dependent RPM fluctuation, or the difference between mechanical and electrical rotation speed in a multi-pole motor. For those specialized cases, consult the equipment's technical documentation. The conversion factors used here (kHz/MHz/GHz as decimal SI prefixes, RPM as ×60 of Hz, and rad/s as ×2π of Hz) are standard and exact, so results are reliable for any input within the range JavaScript can represent as a finite number.