Ghz to Mhz
Convert any value from gigahertz to megahertz with full precision. Use the converter above for instant results, or read on for the exact formula, worked examples, common uses, and answers to frequently asked questions.
About the Gigahertz to Megahertz conversion
Frequency measures the number of times a repeating event occurs per unit of time, most commonly per second. The hertz (Hz), equal to one cycle per second, is the SI unit. Frequencies in audio, radio, computing, and physics span an enormous range, from fractions of a hertz to many gigahertz.
This page focuses specifically on converting gigahertz to megahertz. Use the converter above for instant results, or read on for what each unit is, the exact formula, a worked example, and answers to common questions.
Understanding gigahertz and megahertz
What is a gigahertz?
The gigahertz equals one billion hertz. Modern processor clock speeds, Wi-Fi bands, and mobile-phone frequencies are all quoted in gigahertz.
What is a megahertz?
The megahertz equals one million hertz. It describes FM radio and television broadcast bands and was the standard way to rate processor clock speeds before gigahertz took over.
How a gigahertz compares to a megahertz
The gigahertz is the larger of the two units: one gigahertz is about 1000 megahertz. Because the megahertz is smaller, the same length or quantity works out to a larger number when you measure it with that unit. Knowing which unit is larger is a quick way to sanity-check a conversion: if the numbers move in the wrong direction, the two units have probably been swapped.
Conversion formula
The exact mathematical relationship between gigahertz and megahertz is:
1 gigahertz = 1000 megahertz
So to convert a value V from gigahertz to megahertz, use:
Vmegahertz = Vgigahertz × 1000
To go in the opposite direction:
Vgigahertz = Vmegahertz × 0.001
These factors come from the international definitions published by NIST, BIPM, and ISO 80000 and are exact within their respective standard systems. The converter applies them with full floating-point precision.
Worked example
Using the formula above, here are some common values converted from Gigahertz to Megahertz:
| Gigahertz | Megahertz |
|---|---|
| 1 | 1000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
Sources and accuracy
The hertz is defined as one cycle per second, with the second defined by the caesium-133 transition (BIPM, NIST). All other frequency units are decimal multiples or submultiples of the hertz.
Conversion factors are cross-checked against the NIST SP 811 guide, the BIPM SI brochure, and ISO 80000, plus published historical references for older unit systems. For mission-critical work such as medical dosing, legal-for-trade measurement, aerospace, or large-scale engineering, always verify independently with the original source.
Practical tips
Make sure you are converting frequency (Hz) rather than angular frequency (rad/s). To convert between them, multiply or divide by 2π. This converter uses ordinary frequency.
Frequently asked questions
How many megahertz are in one gigahertz?
One gigahertz equals 1000 megahertz. To convert, multiply your gigahertz value by 1000.
Which is bigger, a gigahertz or a megahertz?
The gigahertz is bigger. One gigahertz equals about 1000 megahertz.
How accurate is this gigahertz to megahertz converter?
It uses the official international conversion factors from NIST and BIPM with full double-precision floating-point accuracy. For everyday use the result is precise to many more decimal places than any practical measurement requires.
Can I convert megahertz back to gigahertz as well?
Yes. Use the swap button above to reverse the From and To fields, or change either dropdown to any unit in the frequency category. The calculation runs entirely in your browser, so it also works offline once the page has loaded.