KB to MB Converter
Convert kilobytes to megabytes using binary (1,024 KB = 1 MB) or decimal (1,000 KB = 1 MB) standards. Choose the right standard for your use case: binary for OS and file systems, decimal for storage manufacturers.
KB to MB Converter
Convert kilobytes to megabytes with decimal (SI) and binary (IEC) conversion standards.
Result
Enter a value and click "Convert" to see the result
KB to MB: Which Standard to Use?
There are two ways to convert kilobytes to megabytes, and they give different results. The difference matters when you're working with file sizes, storage devices, or writing code.
| Standard | 1 MB = | Used by |
|---|---|---|
| Binary (IEC) | 1,024 KB | Windows, macOS, Linux, file systems |
| Decimal (SI) | 1,000 KB | Hard drive / SSD manufacturers, network speeds |
Common Conversion Examples
- 512 KB = 0.5 MB (binary) or 0.512 MB (decimal)
- 1,024 KB = 1 MB (binary) or 1.024 MB (decimal)
- 2,048 KB = 2 MB (binary) or 2.048 MB (decimal)
- 10,000 KB = 9.766 MB (binary) or 10 MB (decimal)
When to Use Each Standard
- Working with files on your computer — use binary (÷ 1,024)
- Storage devices and specs — use decimal (÷ 1,000)
- Programming / APIs — check the library docs; most use binary
- Network speeds (Kbps to Mbps) — use decimal
Frequently Asked Questions
How many KB are in 1 MB?
It depends on the standard used. In the binary (IEC) standard — used by Windows, macOS, and Linux — 1 MB = 1,024 KB. In the decimal (SI) standard — used by hard drive and SSD manufacturers — 1 MB = 1,000 KB. This is why a 1,000 KB file might appear as 0.977 MB in Windows.
What is the formula to convert KB to MB?
Binary (used by operating systems): MB = KB ÷ 1,024. Decimal (used by storage manufacturers): MB = KB ÷ 1,000. For example, 5,120 KB = 5 MB (binary) or 5.12 MB (decimal).
Why does my OS show a different file size than expected?
Operating systems (Windows, macOS, Linux) use binary calculations: 1 MB = 1,024 KB. Storage manufacturers use decimal: 1 MB = 1,000 KB. A file the manufacturer calls 500 KB will show as 488 KB in Windows because Windows uses 1,024 bytes per KB, not 1,000.
What is the difference between KB and KiB?
KB (kilobyte) officially refers to 1,000 bytes under the SI standard, though it is commonly used informally to mean 1,024 bytes. KiB (kibibyte) is the precise IEC term for exactly 1,024 bytes. Most operating systems still label binary values as 'KB' even though they should technically say 'KiB'.
How do I convert 1,500 KB to MB?
Binary: 1,500 ÷ 1,024 = 1.465 MB (what Windows/macOS will show). Decimal: 1,500 ÷ 1,000 = 1.5 MB (what some storage tools show). For most practical purposes when dealing with files on your computer, use the binary calculation.