Convert Megabytes (MB) to Gigabytes (GB)
1 MB = 0.001 GB Two-way converter below, type in either field.
Formula
GB = MB ÷ 1,000
Why this matters
Decimal (SI) units: 1 GB = 1,000 MB = 10⁹ bytes. Storage vendors, ISPs, and macOS report sizes this way. Windows Explorer reports binary gibibytes while labeling them "GB", which is why a "500 GB" drive shows as ~465 GB there, see the GiB to GB converter.
MB to GB reference table
| Megabytes (MB) | Gigabytes (GB) |
|---|---|
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 750 | 0.75 |
| 1,000 | 1 |
| 1,500 | 1.5 |
| 2,000 | 2 |
| 5,000 | 5 |
| 10,000 | 10 |
Frequently asked questions
How many MB are in 1 GB?
1 GB = 1,000 MB in decimal (SI) units, the convention used by drive manufacturers, ISPs, and macOS. In binary units, 1 GiB = 1,024 MiB, that is what Windows actually displays.
Why does my 1 TB drive show less than 1 TB?
The drive really holds 1,000,000,000,000 bytes (1 TB decimal). Windows divides by 1,024 three times and shows ~931 "GB" (really GiB). Nothing is missing, the units differ.
Is 500 MB half a gigabyte?
Yes, 500 MB × 0.001 = 0.5 GB exactly, in decimal units.
More data-unit converters
- Gigabytes → Terabytes TB = GB ÷ 1,000
- Kilobytes → Megabytes MB = kB ÷ 1,000
- Megabits per second → Megabytes per second MB/s = Mbps ÷ 8
- Gibibytes → Gigabytes GB = GiB × 1.073741824 (1 GiB = 1024³ bytes, 1 GB = 1000³ bytes)