GB to MB conversion formula
1 gigabyte = 1000 megabyte
The gigabyte (GB) is 10⁹ bytes in decimal convention (the one storage marketing uses), or 2³⁰ bytes in binary units (GiB) — hence the “missing” space your USB drive always seems to have.
The megabyte (MB) is 10⁶ bytes in decimal convention, or 1,048,576 bytes in binary units (MiB).
GB to MB conversion table
| GB | MB |
|---|---|
| 1 GB | 1000 MB |
| 2 GB | 2000 MB |
| 3 GB | 3000 MB |
| 5 GB | 5000 MB |
| 10 GB | 10000 MB |
| 20 GB | 20000 MB |
| 25 GB | 25000 MB |
| 50 GB | 50000 MB |
| 100 GB | 100000 MB |
| 250 GB | 250000 MB |
| 500 GB | 500000 MB |
| 1000 GB | 1000000 MB |
How to convert GB to MB
- Write down the value in GB you want to convert.
- Multiply it by 1000 — or use the converter above, which does it instantly.
- Read your result in MB. Done.
Frequently asked questions
How many MB is 1 GB?
Using the official conversion factor, 1 gigabyte = 1000 megabyte. The converter above handles any value instantly.
What is the formula to convert gigabyte to megabyte?
1 gigabyte = 1000 megabyte. Multiply any value in GB by this factor to get MB.
Is this GB to MB converter free?
Yes — 100% free, unlimited, with no sign-up. CalculUnits is funded by non-intrusive ads, never by paywalls.