How this calculation works
Decimal prefixes use powers of 1,000; binary prefixes use powers of 1,024. A byte is eight bits. Choose the explicitly labeled unit rather than assuming GB and GiB are identical.
Converted value = value × source factor ÷ destination factorA worked example
1 gibibytes = approximately 1024 mebibytes.
Good to know
Results use fixed factors and rounded decimal display. Region-specific land measures and fluid/dry units not listed here are not inferred.
Reference: NIST: Guide for the use of SI (opens in a new tab) ↗
A gigabyte and a gibibyte count different numbers of bytes
A decimal gigabyte contains 1,000,000,000 bytes, while a gibibyte contains 1,073,741,824 bytes. The latter uses 1,024³ rather than 1,000³. Both units are useful, but their abbreviations and definitions should not be swapped silently.
The difference grows at larger prefixes because the factor is applied repeatedly. One GiB equals 1,024 MiB but approximately 1,073.741824 MB.
Bytes and bits are not the same unit
A byte contains eight bits. A connection rate quoted in megabits per second is not a file size in megabytes and is not a transfer duration. A time estimate also needs a consistent rate, overhead assumptions and the total size.
The selections here are byte-based storage quantities. File-system overhead, reserved capacity and compression are not inferred from a manufacturer’s nominal capacity.
A few questions, answered
Does MB use 1,000 or 1,024 here?
MB is decimal: 1,000,000 bytes. MiB is binary: 1,048,576 bytes.
Does it calculate download time?
No. It converts storage quantities, not rates or transfer durations.