THE NUMORIX GUIDE
How to use the Frequency Converter
Last reviewed September 14, 2026
What this calculator does
The converter normalizes frequency to hertz, or cycles per second, then divides by the destination factor.
Formula and method
The converter normalizes frequency to hertz, or cycles per second, then divides by the destination factor. It uses 1 kHz = 1,000 Hz, 1 MHz = 1e6 Hz, 1 GHz = 1e9 Hz, 1 THz = 1e12 Hz, 1 RPM = 1/60 Hz, and 1 rad/s = 1/(2 pi) Hz.
Variables and inputs
Enter a numeric frequency and choose Hz, kHz, MHz, GHz, THz, revolutions per minute, or radians per second. The UI has separate source and destination selectors and rounds the converted result to six decimal places; it does not collect a wave medium or rotation direction.
Worked example
For 60 Hz converted to rotational units, RPM = 60 / (1/60) = 3,600 RPM and angular frequency = 60 / (1/(2pi)) = 120pi = 376.991118 rad/s after rounding. The same 60 Hz is 0.06 kHz.
How to interpret the result
Frequency counts repeating cycles per unit time. Hertz counts cycles, RPM counts revolutions, and radians per second measures phase angle rate, so the 2pi factor is required when moving between cycles and radians.
Common mistakes to avoid
Do not equate hertz with radians per second without multiplying by 2pi, and divide RPM by 60 to get revolutions per second rather than multiplying. Keep frequency separate from period, which is the reciprocal, and do not infer a direction from a scalar RPM value.
Assumptions and limitations
This page converts a single scalar rate and does not model changing frequency, phase, waveform, modulation, gear ratio, or angular direction. It accepts signed or zero values through the numeric parser even though physical frequency and a period calculation often require a positive value. Display rounding can affect reciprocal calculations.