Megabits to Gigabits
Type a value in either box to convert between megabits and gigabits. The factor is 0.001.
| Megabits | Gigabits |
|---|---|
| 1 Mb | 0.001 Gb |
| 2 Mb | 0.002 Gb |
| 3 Mb | 0.003 Gb |
| 5 Mb | 0.005 Gb |
| 10 Mb | 0.01 Gb |
| 25 Mb | 0.025 Gb |
| 50 Mb | 0.05 Gb |
| 100 Mb | 0.1 Gb |
How to use
- Enter a value in the Megabits field.
- The Gigabits figure appears immediately — no button to press.
- Typing in the Gigabits field converts back to Megabits the same way.
- Use the reference table for the values that come up most often.
Megabits to Gigabits formula
The factor from megabits to gigabits is 0.001.
Gb = Mb × 0.001
Put another way, one megabit is exactly 1/1,000 of a gigabit.
Why this factor: the megabit and the gigabit are both defined against the byte, so dividing one definition by the other gives 0.001 directly. Both definitions are set out in full below.
To go the other way, divide by 0.001 — or use the Gigabits to Megabits converter, which is the same calculation reversed.
Worked example
Start with 500 Mb. Multiply by 0.001 to get 0.5 Gb.
500 Mb × 0.001 = 0.5 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 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.
Megabits vs Gigabits
The megabit and the gigabit 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 gigabits are in a megabit?
One megabit equals 0.001 gigabits.
What is the formula to convert megabits to gigabits?
Multiply the number of megabits by 0.001. To reverse it, divide by 0.001 instead.
How do I convert gigabits back to megabits?
Divide by 0.001, which is the same as multiplying by 1000.
How many gigabits are in 10 megabits?
10 Mb works out to 0.01 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.