Quick Answer:
1 GB = 1,000 MB in decimal (SI) or 1 GiB = 1,024 MiB in binary. Storage makers use decimal; operating systems use binary.
Gigabytes and megabytes appear in storage specs, downloads, and data plans, but binary versus decimal causes confusion.
Detailed Overview: Gigabytes to Megabytes
In decimal SI, 1 GB = 1,000 MB. In binary, 1 GiB = 1,024 MiB. Windows reports binary units but labels them GB and MB, so a 500 GB drive shows as about 465 GiB. Multiply decimal GB by 1,000 for MB. Multiply GiB by 1,024 for MiB.
Conversion Reference Table
1 GB = 1,000 MB, 5 GB = 5,000 MB, 10 GB = 10,000 MB, 50 GB = 50,000 MB, 100 GB = 100,000 MB, 500 GB = 500,000 MB
Practical Calculation Example
Convert 256 GB to MB: 256 × 1,000 = 256,000 MB (decimal). Binary: 256 GiB × 1,024 = 262,144 MiB
Key Takeaways
1 GB = 1,000 MB decimal. 1 GiB = 1,024 MiB binary. 1 GiB = 1.0737 GB.
THE AUTORANK Editorial Note: Always clarify GB vs GiB in technical documentation to avoid customer support tickets.
Frequently Asked Questions
Q: Why does my 500 GB drive show only 465 GB?
A: Because the drive is 500 decimal GB, which equals about 465 binary GiB, and Windows displays GiB labeled as GB.
A: Because the drive is 500 decimal GB, which equals about 465 binary GiB, and Windows displays GiB labeled as GB.
Q: What is the difference between GB and GiB?
A: GB is decimal (10^9 bytes) while GiB is binary (2^30 bytes). GiB is about 7.37% larger than GB.
A: GB is decimal (10^9 bytes) while GiB is binary (2^30 bytes). GiB is about 7.37% larger than GB.
Understanding decimal versus binary units eliminates storage capacity confusion.
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