Gigabyte (GB) to Megabyte (MB) Converter
Enter a value to instantly convert between data storage units.
1 Gigabyte = 1000 Megabyte
Key Formulas
Megabyte → Gigabyte
GB = MB × 0.001Gigabyte → Megabyte
MB = GB × 1000Gigabyte → Terabyte
TB = GB × 0.001Terabyte → Gigabyte
GB = TB × 1000Formula
MB = GB × (1000000000 / 1000000)One gigabyte is 1,000 megabytes in decimal units, so multiply gigabytes by 1,000. A 4.7 GB download is 4,700 MB. People make this switch when a storage plan lists gigabytes and an email attachment cap or upload limit lists megabytes. Drive makers and most download pages use the 1,000 factor. Some operating systems count 1,024 MB per GB, a binary convention that belongs to the gibibyte (GiB) and mebibyte (MiB) units in the data converter.
Source: NIST: decimal prefixes and explicit binary prefixes; 1 byte = 8 bits
Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
Checking a 1 GB video against an upload limit written as 1000 MB.
1 GB = 1000 MB
A 5 GB mobile data plan holds 5000 MB of downloads.
5 GB = 5000 MB
A 2 GB game patch is 2000 MB when you plan around a monthly allowance.
2 GB = 2000 MB
Half a gigabyte, 0.5 GB, leaves 500 MB for photo backups.
0.5 GB = 500 MB