How do I convert bytes to kilobytes?

Divide the number of bytes by 1000, since 1 KB = 1000 bytes. For example, 2500 bytes = 2.5 KB.

How many bytes are in one kilobyte?

In decimal (SI) terms, 1 kilobyte = 1000 bytes, so 1 byte = 0.001 KB.

Is a kilobyte 1000 or 1024 bytes?

This converter uses the decimal SI definition of 1 KB = 1000 bytes, which is how storage and file sizes are usually labelled. The 1024-byte unit is the kibibyte (KiB) in the binary IEC system.

How do I convert kilobytes back to bytes?

Multiply the kilobytes by 1000, or just type into the Kilobytes field — the converter is bidirectional and fills in the bytes value for you. For example, 4 KB = 4000 bytes.

Why does my file show a slightly different size?

Some operating systems display sizes in binary units (1 KiB = 1024 bytes) while labelling them KB, which makes the same file look a little smaller in KB. This tool uses the decimal 1000-byte kilobyte.

Is my data sent to a server?

No. All conversions run entirely in your browser; nothing you type is uploaded.

Bytes to Kilobytes Converter

Convert digital storage between bytes (B) and kilobytes (KB) in either direction. It is handy for reading file sizes, API payload limits and asset budgets where values are quoted in raw bytes.

How it works

The converter uses the decimal SI definition of the kilobyte:

1 KB = 1000 bytes, so KB = bytes ÷ 1000

Type into either field and the other updates instantly — entering bytes divides by 1000, and entering kilobytes multiplies by 1000.

Example

Convert 2500 bytes to KB:

2500 ÷ 1000 = 2.5 KB

And 4 KB back to bytes:

4 × 1000 = 4000 bytes

Bytes (B)	Kilobytes (KB)
1 B	0.001 KB
100 B	0.1 KB
500 B	0.5 KB
1000 B	1 KB

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