Gigabytes to Megabytes
Convert gigabytes to megabytes instantly. Free, fast, no signup.
How to use this tool
- Enter gigabytes in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your megabytes and the full breakdown beneath it.
Convert gigabytes to megabytes instantly. Free, fast, no signup.
Formula
Megabytes = Gigabytes × 1,024
MB = GB × 1024
In binary (IEC) notation, 1 GiB = 210 MiB = 1,024 MiB, so multiplying gigabytes by 1,024 gives megabytes.
How it works
Moving down the binary prefix ladder from gigabytes to megabytes means multiplying by 1,024, because each prefix step represents a factor of 210. This is the exact inverse of the MB-to-GB conversion.
A common mistake is multiplying by 1,000 instead of 1,024. Operating systems and software typically use 1,024-based binary gigabytes, whereas some storage manufacturers use 1,000-based decimal gigabytes — so always clarify which convention applies before comparing capacities.
Worked example
Convert 1 GB to MB
- Start with 1 GB.
- Multiply by the binary prefix step: 1 × 1,024.
- Result requires no further rounding.
1 GB = 1024.0 MB
Common mistakes to avoid
- Multiplying by 1000 instead of 1024 -- storage manufacturers use 1 GB = 1000 MB (decimal), while operating systems use 1 GiB = 1024 MiB (binary); mixing these definitions causes the 'missing space' confusion.
- Confusing gigabytes (GB) with gigabits (Gb) -- 1 Gb = 125 MB, not 1024 MB.
- Applying the result to RAM planning without noting that Windows reports RAM in GiB -- 8 GiB of RAM = 8192 MiB, but Windows may show it as '8 GB.'
Key terms
- Gigabyte (GB)
- A unit of digital storage equal to 1,024 megabytes in binary convention, or 1,000,000,000 bytes in decimal (SI) convention.
- Megabyte (MB)
- A unit of digital storage equal to 1,024 kilobytes (220 bytes) in binary convention.
- Binary vs. decimal convention
- Computing traditionally uses binary multiples (powers of 1,024), while the SI system uses decimal multiples (powers of 1,000). This difference causes the apparent discrepancy between advertised and reported storage sizes.
- Storage capacity
- The maximum amount of data a storage medium can hold, expressed in bytes or a multiple thereof (KB, MB, GB, TB).
Frequently asked questions
- How do I convert gigabytes to megabytes?
- Multiply the number of gigabytes by 1024 to get megabytes.