UnitConGigabytes to Megabytes Converter
Convert gigabytes to megabytes for file sizes, storage capacity planning, and download estimates. This decimal conversion (1 GB = 1000 MB) reflects how storage manufacturers and internet providers report data.
Formula
Multiply gigabytes by 1000 to get megabytes (decimal). To reverse, divide megabytes by 1000 to get gigabytes.
Quick reference
| Gigabyte (GB) | Megabyte (MB) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 4 | 4,000 |
| 8 | 8,000 |
| 16 | 16,000 |
| 32 | 32,000 |
| 64 | 64,000 |
| 128 | 128,000 |
| 256 | 256,000 |
| 512 | 512,000 |
About these units
Gigabyte
The gigabyte (10⁹ bytes) became a common storage unit in the 1990s as hard drives grew from megabytes to gigabytes in capacity. Disk manufacturers use decimal (SI) prefixes, so 1 GB = 1,000,000,000 bytes.
Megabyte
The megabyte (10⁶ bytes) was the dominant file size unit in the 1980s and 1990s, covering everything from floppy disks to early hard drives. Today it measures individual files like documents, photos, and songs.
Frequently asked questions
In decimal (SI) convention, 1 GB = 1000 MB. In binary convention, 1 GiB (gibibyte) = 1024 MiB. Storage manufacturers use decimal; operating systems traditionally used binary, causing the confusion.
4 × 1000 = 4000 MB in SI decimal; approximately 3814 MiB in binary.
At 3 MB per JPEG photo, approximately 333 photos fit in 1 GB.