Megabytes to Kilobytes Converter

Convert MB to KB instantly — 1 MB = 1000 KB. Free, browser-only tool.

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This free digital storage converter changes megabytes (MB) into kilobytes (KB) and back again, updating live as you type. It is handy when an upload limit, email attachment, or asset budget is quoted in KB but your file size is shown in MB.

How it works

The tool uses the decimal (SI) definition, 1 MB = 1000 KB, so the maths is a single multiply or divide:

  • KB = MB × 1000
  • MB = KB ÷ 1000

The relationship is exact and linear, so the converter works in both directions — type in either field and the other updates instantly. Some operating systems count in binary (1 MiB = 1024 KiB), which can make reported sizes differ slightly from advertised ones.

Example

An image host caps uploads at 800 KB and your photo is 1.2 MB.

1.2 × 1000 = 1200 KB, which is over the 800 KB limit — you would need to compress it.

Megabytes (MB)Kilobytes (KB)
0.5 MB500 KB
1 MB1000 KB
100 MB100000 KB
500 MB500000 KB
1000 MB1000000 KB

All calculations run entirely in your browser — no data is sent to any server.

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