How many kibibytes are in a mebibyte?

Exactly 1,024 KiB. Both units are IEC binary prefixes: 1 KiB = 1,024 bytes and 1 MiB = 1,024 KiB = 1,048,576 bytes. The factor of 1,024 comes from 2¹⁰, the base-2 step between adjacent binary prefixes.

What is the difference between MiB and MB?

1 MiB (mebibyte, IEC binary) = 1,048,576 bytes. 1 MB (megabyte, SI decimal) = 1,000,000 bytes. Storage manufacturers use the decimal definition; operating systems and RAM chips use the binary one. IEC introduced MiB in 1998 to make the distinction unambiguous.

What is the difference between KiB and KB?

1 KiB (kibibyte, IEC binary) = 1,024 bytes. 1 KB (kilobyte, SI decimal) = 1,000 bytes. The IEC prefix "kibi" (Ki) means ×1,024, while the SI prefix "kilo" (k) means ×1,000.

Is the MiB to KiB conversion exact?

Yes. 1 MiB = 1,024 KiB by definition — no rounding involved. For any integer MiB input the KiB result is also an integer. Fractional MiB values use JavaScript 64-bit floating-point arithmetic, accurate to 15–16 significant digits.

When would I need MiB to KiB conversion?

Commonly when writing linker scripts, configuring memory regions for embedded targets, reading Linux kernel documentation that mixes MiB and KiB units, or translating cache sizes between the MiB values in CPU specs and the KiB values expected by system configuration files.

Mebibytes to Kibibytes Converter

Name: Mebibytes to Kibibytes Converter
Availability: InStock
Author: Nham Vu

Enter a mebibyte (MiB) value and instantly get the exact kibibyte (KiB) count — 1 MiB = 1,024 KiB by IEC binary standard.

Enter Mebibytes

Mebibytes (MiB)

Binary vs decimal units

1 MiB → KiB (binary) × 1,024

1 MB → KB (decimal) × 1,000

IEC 80000-13 defines MiB and KiB as strict powers-of-two units (2²⁰ and 2¹⁰ bytes), distinct from the SI decimal MB and KB used by storage manufacturers.

Result

Enter a MiB value and click Convert.

Common MiB to KiB Reference

MiB	KiB (× 1,024)	KB (× 1,000)	Common size

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Summary

Enter a mebibyte (MiB) value and instantly get the exact kibibyte (KiB) count — 1 MiB = 1,024 KiB by IEC binary standard.

How it works

Enter any number of mebibytes in the input field.
The converter multiplies by 1,024 to produce the exact kibibyte count (IEC binary standard).
A secondary result shows the equivalent in kilobytes (KB) using the SI decimal standard (× 1,000) for comparison.
The reference table lists common MiB values alongside their exact KiB equivalents.
Copy any result with the copy button.

Use cases

Convert a 256 MiB RAM allocation to KiB for a low-level memory map or linker script.
Translate file sizes reported in MiB by df or du into KiB for comparison with other tools.
Verify that a network buffer of N MiB matches an expected KiB count in a protocol spec.
Cross-check MiB vs KiB values when reading Linux /proc/meminfo or Windows Task Manager.
Calculate cache sizes in KiB from MiB specs listed in CPU datasheets.
Convert firmware image sizes between MiB and KiB for embedded system deployment.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu