GB to MB Converter
Convert gigabytes to megabytes instantly using our digital conversion calculator.
GB to MB Conversion Reference Chart
Here is a quick reference chart showing how common file sizes in Gigabytes (GB) convert into Megabytes (MB), calculated in both standard binary (1024 bytes) and decimal (1000 bytes) formats:
| Gigabytes (GB) | Megabytes (MB) - Binary | Megabytes (MB) - Decimal |
|---|---|---|
| 0.1 GB | 102.4 MB | 100 MB |
| 0.5 GB | 512 MB | 500 MB |
| 1 GB | 1,024 MB | 1,000 MB |
| 2 GB | 2,048 MB | 2,000 MB |
| 5 GB | 5,120 MB | 5,000 MB |
| 10 GB | 10,240 MB | 10,000 MB |
| 20 GB | 20,480 MB | 20,000 MB |
| 40 GB | 40,960 MB | 40,000 MB |
| 50 GB | 51,200 MB | 50,000 MB |
| 100 GB | 102,400 MB | 100,000 MB |
GB to MB Conversion Reference Chart (e.g. 100 GB in MB)
Use this quick reference chart to see how common file sizes in Gigabytes (GB) convert into Megabytes (MB), calculated in both binary (e.g., 100 GB in MB = 102,400 MB) and decimal formats (100,000 MB).
About the GB to MB Converter
Gigabytes and megabytes sit right next to each other in everyday digital life — a phone's camera roll, a laptop's free storage warning, a game's install size. This converter handles the math instantly: 1 GB always equals 1,024 MB in the binary system your operating system actually uses (macOS, Windows, and Android all report storage this way), or 1,000 MB in the decimal system storage manufacturers use on product packaging — which is exactly why a "512 GB" phone shows less than 512 GB of usable space once the OS reports it.
Why This Conversion Comes Up So Often
Checking if a download will fit.
A 2.3 GB game update needs to fit in whatever MB of free space your device reports — this converter turns the marketing number into the number your device actually shows you.
Understanding camera and video file sizes.
A few minutes of 4K video can easily hit several hundred MB, and a full memory card's worth adds up to GB fast. Knowing the conversion helps you judge how much footage actually fits before you run out of space mid-shoot.
Frequently Asked Questions
How many MB are in 1 GB?
Exactly 1,024 MB in the binary system used by operating systems, or 1,000 MB in the decimal system used by storage manufacturers — this gap is why advertised and actual storage never quite match.
Why does my phone show less storage than advertised?
Manufacturers list capacity in decimal GB (1 GB = 1,000 MB), but your operating system reports it in binary (1 GB = 1,024 MB) and also reserves space for the OS itself — both factors combined explain the difference.
Can this tool convert an actual file?
This calculator converts numbers. To shrink a real photo or document to a specific target size, use our Compress Image tool.