How do I convert Megabytes to Kilobytes?

Multiply the number of megabytes by 1000. For example, 5 MB × 1000 = 5000 KB. This tool uses the decimal (SI) definition where 1 MB = 1000 KB.

How many KB are in one MB?

There are 1000 kilobytes in one megabyte (1 MB = 1000 KB) in the decimal system used here.

Is it 1000 or 1024 KB in a MB?

This converter uses the decimal SI standard, 1 MB = 1000 KB, which is how storage and bandwidth are advertised. The binary equivalent is 1 MiB = 1024 KiB, used by some operating systems when reporting file sizes.

How do I convert KB back to MB?

Divide the number of kilobytes by 1000. For example, 2500 KB ÷ 1000 = 2.5 MB. The converter does this automatically when you type in the kilobytes field.

How big is 500 KB in MB?

500 KB ÷ 1000 = 0.5 MB, half a megabyte — roughly the size of a high-quality web photo.

Is my data uploaded anywhere?

No. The calculation is simple arithmetic performed entirely in your browser; nothing is sent to a server.

Megabytes to Kilobytes Converter

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 MB	500 KB
1 MB	1000 KB
100 MB	100000 KB
500 MB	500000 KB
1000 MB	1000000 KB

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