When you need to convert frequency units
Frequency counts how many cycles of a repeating event happen each second, and its base unit is the hertz (Hz), one cycle per second. Everyday quantities span an enormous range, so people rarely write them all in hertz: mains electricity is 50 or 60 Hz, audio runs from tens of hertz to about 20 kHz, FM radio is around 88 to 108 MHz, and Wi-Fi and microwave ovens sit near 2.4 GHz. This converter moves a value between Hz, kHz, MHz and GHz.
It is most useful when a datasheet, a radio band plan, a processor specification or a physics problem gives a figure in one prefix and you need another, for example turning a clock speed in GHz into MHz, or an oscillator marked in kHz into plain hertz. Because the units differ only by powers of 1,000, the conversion is exact apart from display rounding.
How the conversion works
The calculator first converts your value to hertz by multiplying by the factor of the source unit, then divides by the factor of the target unit:
- Result = value × factor(from) ÷ factor(to).
- Factors in hertz: Hz = 1, kHz = 1,000, MHz = 1,000,000, GHz = 1,000,000,000.
- The answer is shown with six digits after the decimal point, followed by the target unit.
- Moving one step up (Hz to kHz, kHz to MHz, MHz to GHz) divides by 1,000; one step down multiplies by 1,000.
Worked example
Convert 2.4 GHz to MHz. The factor for GHz is 1,000,000,000 and for MHz is 1,000,000, so the result is 2.4 × 1,000,000,000 ÷ 1,000,000 = 2,400. The calculator displays 2400.000000 MHz.
As a second check, convert 88.5 MHz (a typical FM station) to Hz: 88.5 × 1,000,000 ÷ 1 = 88,500,000, displayed as 88500000.000000 Hz. Going back the other way, 88,500,000 Hz to MHz divides by 1,000,000 and returns 88.5, confirming the conversion is reversible.
Common mistakes and how to interpret the result
- Expecting small values to survive in large units. Output is rounded to six decimals, so 50 Hz expressed in GHz appears as 0.000000 GHz. That is rounding, not zero; convert to a smaller target unit to see the digits.
- Mixing up frequency and wavelength or period. This tool changes the unit of the same quantity. To get wavelength or the time of one cycle you need a different calculation.
- Confusing prefix case. Lowercase m would mean milli, not mega. Only kHz, MHz and GHz are used here, with MHz and GHz using capital M and G.
- Treating hertz as angular frequency. Radians per second differ from hertz by a factor of 2π, so a value in rad/s cannot be entered directly.