MB to GB formula
To convert megabytes to gigabytes, multiply the number of megabytes by 0.001. In symbols: GB = MB × 0.001.
One megabyte equals 0.001 gigabytes, and one gigabyte equals 1,000 megabytes. This page uses decimal SI units, so 1 GB is exactly 1,000 MB. Some operating systems divide by 1,024 instead, which is the binary unit called GiB.
Worked example
Suppose you have 2,500 megabytes and need the answer in gigabytes.
- Write the formula: GB = MB × 0.001.
- Put in the number: 2,500 × 0.001 = 2.5.
- Round to suit the job. 2.5 GB is accurate enough for most everyday uses.
So 2,500 MB is 2.5 GB. To check, convert back: 2.5 GB is 2,500 MB.
Common megabytes to gigabytes values
| megabytes (MB) | gigabytes (GB) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
Reference points
Some familiar amounts in megabytes, converted to gigabytes:
- 100 MB, a few songs: 0.1 GB
- 700 MB, an old CD: 0.7 GB
- 1,000 MB, one decimal gigabyte: 1 GB
- 4,700 MB, a single-layer DVD: 4.7 GB
Where you will use it
Phone plans, photo libraries, app sizes and download limits mix megabytes and gigabytes. Converting tells you whether a 2,500 MB video fits into a 2 GB data allowance.
Quick mental math
Move the decimal point three places left. For the 1,024 convention use the data size converter with MiB and GiB.
Going the other way
Need the reverse? Use the GB to MB converter. For comparison, 1 GB is 1,000 MB. To compare every data size unit at once, open the data size converter.
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