Megabyte to Gigabyte Converter
Converts megabyte to gigabyte (MB to GB) and back. The conversion factor is shown below every result.
How to Convert Megabyte to Gigabyte
What Is a Megabyte?
A megabyte (MB), by the SI prefix standard, is 1,000,000 bytes.
What Is a Gigabyte?
A gigabyte (GB), by the SI prefix standard, is 1,000,000,000 bytes (1,000 MB). This is why a drive labeled 1 TB often shows a smaller number in an OS that reports binary (GiB) values instead.
Common Megabyte to Gigabyte Reference Points
Real-world reference values for quick sanity checks.
| Item | Megabyte (MB) | Gigabyte (approx.) |
|---|---|---|
| A 3-minute MP3 song (approx.) | 5 MB | 0.005 GB |
| A feature-length HD movie file (approx.) | 4000 MB | 4 GB |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Megabyte to Gigabyte Conversion Table
| Megabyte (MB) | Gigabyte (GB) |
|---|---|
| 1 MB | 0.001 GB |
| 10 MB | 0.01 GB |
| 100 MB | 0.1 GB |
| 500 MB | 0.5 GB |
| 1000 MB | 1 GB |
| 2000 MB | 2 GB |
| 4000 MB | 4 GB |
| 8000 MB | 8 GB |
| Source: NIST SI prefix guidance; IEC 60027-2 | |
Frequently Asked Questions
How do I convert megabytes to gigabytes?
Divide the megabyte value by 1,000 (or multiply by 0.001). For example, 7,500 MB × 0.001 = 7.5 GB.
Why does a 1 TB drive show as less than 1,000 GB on my computer?
That's the decimal-vs-binary discrepancy: manufacturers label drives using decimal (1,000-based) terabytes and gigabytes, matching the SI standard, while some operating systems report free space using 1,024-based math under the same GB label. The drive isn't actually smaller; the two numbering systems just don't agree.
Is this the same MB used for internet speed?
Internet speeds are usually quoted in megabits per second (Mbps), not megabytes (MB). A megabyte is 8 megabits, so don't confuse the two when estimating download times.
Related Data Storage Converters
A good measuring tool marked in both MB and GB removes the guesswork at the point of use.