Megabytes to Gigabytes
Type a value in either box to convert between megabytes and gigabytes. The factor is 0.001.
| Megabytes | Gigabytes |
|---|---|
| 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 Megabytes field.
- The Gigabytes figure appears immediately — no button to press.
- Typing in the Gigabytes field converts back to Megabytes the same way.
- Use the reference table for the values that come up most often.
Megabytes to Gigabytes formula
Converting megabytes to gigabytes is a single multiplication by 0.001.
GB = MB × 0.001
Put another way, one megabyte is exactly 1/1,000 of a gigabyte.
Why this factor: the megabyte and the gigabyte 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 Gigabytes to Megabytes 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 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.
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.
Megabytes vs Gigabytes
The megabyte 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 megabyte?
One megabyte equals 0.001 gigabytes.
What is the formula to convert megabytes to gigabytes?
Multiply the number of megabytes by 0.001. To reverse it, divide by 0.001 instead.
How do I convert gigabytes back to megabytes?
Divide by 0.001, which is the same as multiplying by 1000.
How many gigabytes are in 10 megabytes?
10 MB works out to 0.01 GB.
How is the megabyte defined?
Exactly 1,000,000 bytes under SI prefixes. The binary mebibyte (MiB) is 1,048,576 bytes.