How to convert gigabytes to megabytes
To convert gigabytes to megabytes, multiply by 1,000. Data size conversions matter for file uploads, cloud storage plans, hard drives and internet usage. Decimal (SI) prefixes are used: 1 KB = 1,000 bytes.
Gigabyte to Megabyte conversion table
| Gigabyte (GB) | Megabyte (MB) |
|---|---|
| 0.1 GB | 100 MB |
| 0.5 GB | 500 MB |
| 1 GB | 1,000 MB |
| 2 GB | 2,000 MB |
| 3 GB | 3,000 MB |
| 4 GB | 4,000 MB |
| 5 GB | 5,000 MB |
| 10 GB | 10,000 MB |
| 20 GB | 20,000 MB |
| 25 GB | 25,000 MB |
| 50 GB | 50,000 MB |
| 100 GB | 100,000 MB |
| 500 GB | 500,000 MB |
| 1,000 GB | 1,000,000 MB |
About the units
Gigabyte (GB)
A gigabyte is 1,000,000,000 bytes and the common unit for phone storage and data plans.
Megabyte (MB)
A megabyte is 1,000,000 bytes, roughly the size of a short MP3 minute or a photo.
How to use this converter
- Type the number of gigabytes (GB) in the input box.
- The result in megabytes appears instantly — no button needed.
- See the same value in every other data storage unit just below.
- Use “Swap units” to convert megabytes back to gigabytes.
When you’ll use the gigabyte to megabyte conversion
Converting gigabytes to megabytes comes up more often than you might expect — for example when estimating download times, comparing phone or cloud storage plans, or checking whether a file fits an upload limit. Type your number once and you get the exact answer plus every related unit, so you don’t need to convert twice.
💡 The factor is exact and easy to remember: 1 GB = 1,000 MB.
Watch out for these mix-ups
- Drive makers use 1 KB = 1,000 bytes; operating systems often show KiB (1,024).
- Internet speeds are in bits per second, file sizes in bytes — a factor of 8.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many megabytes are in one gigabyte?
One gigabyte equals 1,000 megabytes. 1,000 is the exact factor used by this converter.
How do I convert gigabytes to megabytes?
Multiply the value in gigabytes by 1,000. To go the other way, multiply megabytes by 0.001.
What is 10 GB in MB?
10 GB = 10,000 MB. Also, 5 GB = 5,000 MB and 100 GB = 100,000 MB.
What is the difference between a gigabyte and a megabyte?
A gigabyte is 1,000,000,000 bytes and the common unit for phone storage and data plans. A megabyte is 1,000,000 bytes, roughly the size of a short MP3 minute or a photo.
Is this tool free and private?
Yes — the Gigabyte to Megabyte is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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