GB to MB formula
To convert gigabytes to megabytes, multiply the number of gigabytes by 1,000. In symbols: MB = GB × 1,000.
One gigabyte equals 1,000 megabytes, and one megabyte equals 0.001 gigabytes. With decimal SI prefixes 1 GB is exactly 1,000 MB, so the result is exact. In the binary convention 1 GiB is 1,024 MiB.
Worked example
Suppose you have 4 gigabytes and need the answer in megabytes.
- Write the formula: MB = GB × 1,000.
- Put in the number: 4 × 1,000 = 4,000.
- Round to suit the job. 4,000 MB is accurate enough for most everyday uses.
So 4 GB is 4,000 MB. To check, convert back: 4,000 MB is 4 GB.
Common gigabytes to megabytes values
| gigabytes (GB) | megabytes (MB) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 50 | 50,000 |
| 100 | 100,000 |
Reference points
Some familiar amounts in gigabytes, converted to megabytes:
- 1 GB, a typical daily data plan: 1,000 MB
- 4 GB, a feature film in standard definition: 4,000 MB
- 16 GB, a common phone storage tier: 16,000 MB
- 128 GB, a mid-range phone: 128,000 MB
Where you will use it
Data plans are sold in gigabytes while individual downloads, photos and apps are measured in megabytes. Converting shows how many photos or songs a plan really holds.
Quick mental math
Add three zeros to the GB value. Divide the result by the size of one file to count how many fit.
Going the other way
Need the reverse? Use the MB to GB converter. For comparison, 1 MB is 0.001 GB. To compare every data size unit at once, open the data size converter.
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