Megabits to Gigabytes
Convert megabits to gigabytes instantly — one megabit is 0.000125 gigabytes.
| Megabits | Gigabytes |
|---|---|
| 1 Mb | 0.000125 GB |
| 2 Mb | 0.00025 GB |
| 3 Mb | 0.000375 GB |
| 5 Mb | 0.000625 GB |
| 10 Mb | 0.00125 GB |
| 25 Mb | 0.003125 GB |
| 50 Mb | 0.00625 GB |
| 100 Mb | 0.0125 GB |
How to use
- Enter a value in the Megabits field.
- The Gigabytes figure appears immediately — no button to press.
- Typing in the Gigabytes field converts back to Megabits the same way.
- Use the reference table for the values that come up most often.
Megabits to Gigabytes formula
The factor from megabits to gigabytes is 0.000125.
GB = Mb × 0.000125
Put another way, one megabit is exactly 1/8,000 of a gigabyte.
Why this factor: the megabit and the gigabyte are both defined against the byte, so dividing one definition by the other gives 0.000125 directly. Both definitions are set out in full below.
To go the other way, divide by 0.000125 — or use the Gigabytes to Megabits converter, which is the same calculation reversed.
Worked example
Given 500 Mb, multiplying by 0.000125 yields 0.0625 GB.
500 Mb × 0.000125 = 0.0625 GB
The converter above does this for any value you type, in either direction.
What is a megabit?
A megabit is one million bits — the unit internet speeds are advertised in.
Definition: Exactly 1,000,000 bits, so exactly 125,000 bytes.
Where it is used: Broadband speed tiers and video streaming bitrates, quoted as Mb/s or Mbps.
Worth knowing: Divide advertised megabits per second by 8 to get the megabytes per second a download will actually show.
What is a gigabyte?
A gigabyte is one billion bytes — the everyday unit of storage and memory capacity.
Definition: Exactly 1,000,000,000 bytes under SI prefixes. The binary gibibyte (GiB) is 1,073,741,824 bytes.
Where it is used: Phone and laptop storage, RAM capacity, video file sizes, and cloud storage plans.
Megabits vs Gigabytes
The megabit and the gigabyte 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 gigabytes are in a megabit?
One megabit equals 0.000125 gigabytes.
What is the formula to convert megabits to gigabytes?
Multiply the number of megabits by 0.000125. To reverse it, divide by 0.000125 instead.
How do I convert gigabytes back to megabits?
Divide by 0.000125, which is the same as multiplying by 8000.
How many gigabytes are in 10 megabits?
10 Mb works out to 0.00125 GB.
Is there anything to watch out for with megabits?
Divide advertised megabits per second by 8 to get the megabytes per second a download will actually show.
How is the megabit defined?
Exactly 1,000,000 bits, so exactly 125,000 bytes.