Kilobyte to Megabyte Converter
Convert kilobytes to megabytes and back using SI (1,000) or IEC binary (1,024) standards.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
Megabytes (MB)
1.0240 Megabytes (MB)
Factor: 1 MB = 1000 KB
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the Kilobyte to Megabyte Converter
The kilobyte to megabyte converter changes file sizes using either the decimal SI standard (1 MB = 1,000 KB) or the binary IEC standard (1 MiB = 1,024 KiB). Choose the standard that matches your source: storage makers and networks use decimal, while operating systems and RAM use binary.
How to use it
- 1Choose the SI or IEC standard.
- 2Choose KB → MB or MB → KB.
- 3Enter the size and read the result.
- 4Copy, share or print the result with the buttons below it.
Worked example
1,024 KB is exactly 1 MiB in binary, but 1.024 MB in the decimal standard.
How it works
Standards
SI: 1 MB = 1,000 KB = 1,000,000 B (disk manufacturers).
IEC: 1 MiB = 1,024 KiB = 1,048,576 B (operating systems, RAM).
Common use cases
- Checking file upload limits
- Comparing reported file sizes
- Estimating attachment sizes
Frequently asked questions
A:SI: 1 MB = 1,000 KB. IEC: 1 MiB = 1,024 KiB. The difference causes the "missing space" on drives.
A:Use SI (1,000) for storage and network specifications; use IEC (1,024) for RAM and OS reported sizes.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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