Gigabytes to Megabytes Converter
One Gigabyte equals 1000 Megabytes (1 GB = 1000 MB). Multiply a Gigabyte value by 1000 to get the equivalent in Megabytes. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.
Formula
MB = GB × 1000
Multiply the Gigabyte value by 1000 to get the equivalent value in Megabytes.
Example Conversions
1 Gigabyte (GB)
1000 Megabyte (MB)
5 Gigabyte (GB)
5000 Megabyte (MB)
10 Gigabyte (GB)
10000 Megabyte (MB)
25 Gigabyte (GB)
25000 Megabyte (MB)
100 Gigabyte (GB)
100000 Megabyte (MB)
Conversion Table
| Gigabyte (GB) | Megabyte (MB) |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
How to Convert Manually
Use these steps to convert Gigabyte values to Megabyte without the calculator.
- Write down the value in Gigabyte (GB) that you want to convert.
- Multiply that value by 1000.
- For example, 10 Gigabytes × 1000 = 10000 Megabytes.
- Label the result as Megabyte (MB).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Gigabyte and one Megabyte.
About Gigabyte and Megabyte
The gigabyte is an SI decimal data unit equal to exactly 1,000 megabytes, or one billion bytes. Device storage and mobile data plans are commonly sold in gigabytes. The megabyte is an SI decimal data unit equal to exactly 1,000 kilobytes, or 1,000,000 bytes. Photos, songs, and app downloads are commonly measured in megabytes. One Gigabyte equals 1000 Megabytes (1 GB = 1000 MB). Gigabyte is used in phone and laptop storage and in cloud storage quotas. Megabyte is used in photo and music file sizes.
Precision and Rounding:This converter keeps SI decimal prefixes (1 KB = 1,000 bytes) separate from IEC binary prefixes (1 KiB = 1,024 bytes). Match the symbol used by your source before converting because some operating-system interfaces display binary quantities with decimal labels.
See our guide to megabits vs. megabytes if you're unsure which one your download speed is quoted in.
Data units follow NIST guidance: decimal SI prefixes use powers of 1,000, while IEC binary prefixes use powers of 1,024 (reference).
Worked Example
15Gigabytes equals15000Megabytes.
15 GB × 1000 = 15000 MB
FAQ
How do I convert Gigabyte to Megabyte?
Multiply the Gigabyte value by 1000 to get the equivalent value in Megabytes.
What is the formula for Gigabyte to Megabyte?
The formula is MB = GB × 1000.
How many Megabytes are in 1 Gigabyte?
1 Gigabyte equals 1000 Megabytes.
Can I convert Megabyte back to Gigabyte?
Yes. 1 Megabyte equals 0.001 Gigabytes, and the related converter can reverse the calculation.
What are common names for Gigabyte and Megabyte?
Gigabyte is shown as GB and may also be searched as gigabytes, gb, decimal gigabyte. Megabyte is shown as MB and may also be searched as megabytes, mb, decimal megabyte.
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