Gigabits to Megabytes
Convert gigabits to megabytes instantly — one gigabit is 125 megabytes.
| Gigabits | Megabytes |
|---|---|
| 1 Gb | 125 MB |
| 2 Gb | 250 MB |
| 3 Gb | 375 MB |
| 5 Gb | 625 MB |
| 10 Gb | 1250 MB |
| 25 Gb | 3125 MB |
| 50 Gb | 6250 MB |
| 100 Gb | 12500 MB |
How to use
- Enter a value in the Gigabits field.
- The Megabytes figure appears immediately — no button to press.
- Typing in the Megabytes field converts back to Gigabits the same way.
- Use the reference table for the values that come up most often.
Gigabits to Megabytes formula
Converting gigabits to megabytes is a single multiplication by 125.
MB = Gb × 125
Put another way, one gigabit is exactly 125 megabytes.
Why this factor: the gigabit and the megabyte are both defined against the byte, so dividing one definition by the other gives 125 directly. Both definitions are set out in full below.
To go the other way, divide by 125 — or use the Megabytes to Gigabits converter, which is the same calculation reversed.
Worked example
Given 64 Gb, multiplying by 125 yields 8000 MB.
64 Gb × 125 = 8000 MB
The converter above does this for any value you type, in either direction.
What is a gigabit?
A gigabit is one billion bits, the unit of modern high-speed networking.
Definition: Exactly 1,000,000,000 bits, so exactly 125,000,000 bytes.
Where it is used: Gigabit Ethernet, fiber broadband tiers, and data-centre interconnects.
What is a megabyte?
A megabyte is one million bytes, the familiar unit for photos, songs and app sizes.
Definition: Exactly 1,000,000 bytes under SI prefixes. The binary mebibyte (MiB) is 1,048,576 bytes.
Where it is used: Photo and audio file sizes, app downloads, and mobile data allowances.
Gigabits vs Megabytes
The gigabit and the megabyte belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many megabytes are in a gigabit?
One gigabit equals 125 megabytes.
What is the formula to convert gigabits to megabytes?
Multiply the number of gigabits by 125. To reverse it, divide by 125 instead.
How do I convert megabytes back to gigabits?
Divide by 125, which is the same as multiplying by 0.008.
How many megabytes are in 10 gigabits?
10 Gb works out to 1250 MB.
How is the gigabit defined?
Exactly 1,000,000,000 bits, so exactly 125,000,000 bytes.