Is this converter accurate?

Conversions use exact defined factors where they exist (for example 1 inch = 2.54 cm exactly) and results are shown to 8 significant digits.

Why are there two kinds of megabyte?

Storage makers use decimal units (1 MB = 1,000,000 bytes) while operating systems often use binary units (1 MiB = 1,048,576 bytes). Both sets are included.

Data Storage Converter - Free Online Tool

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Convert between bytes, KB, MB, GB, TB and their binary equivalents.