Kilobytes to Bytes (KB to B) Converter
1 kilobyte equals 1,000 bytes — multiply kilobytes by 1,000 to convert KB to bytes. Using the decimal (SI) definition, the kilo prefix means exactly one thousand, so a kilobyte is 1,000 bytes.
The formula
To convert kilobytes to bytes, multiply by the exact factor:
B = KB × 1,000
For example, 25 KB × 1,000 = 25,000 bytes. Moving from KB to bytes shifts the decimal three places to the right.
Conversion table
| Kilobytes (KB) | Bytes (B) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 500 | 500,000 |
| 1000 | 1,000,000 |
How to convert online
- Type the number of kilobytes into the first box.
- Read the byte result instantly in the second box.
- Or enter a byte value to convert back to kilobytes — it works both ways.
Use the Kilobyte to Byte Converter — free and instant in your browser.
Where this conversion is used
Developers and system administrators frequently step between kilobytes and raw bytes when reading file sizes, setting buffer or upload limits, and inspecting HTTP headers or database fields that report exact byte counts. Because most modern operating systems and web standards use the decimal kilobyte, the clean 1,000 factor is the one you will meet in practice.
FAQ
How many bytes are in a kilobyte?
One kilobyte equals 1,000 bytes under the decimal (SI) definition used by storage manufacturers and most networks.
Is a kilobyte 1,000 or 1,024 bytes?
The SI kilobyte is 1,000 bytes. The 1,024-byte unit is properly called a kibibyte (KiB), a binary measure often used by older software.
How do I convert bytes back to kilobytes?
Divide the byte value by 1,000 (or multiply by 0.001). For example, 50,000 bytes = 50 KB.
Is the conversion exact?
Yes. The decimal kilobyte is exactly 1,000 bytes, so there is no rounding.
Related converters
- Byte to Kilobyte Converter
- Kilobyte to Bit Converter
- Kilobyte to Megabyte Converter
- Kilobyte to Gigabyte Converter
Built by ByteVancer
ByteTools is a free product of ByteVancer, a software and web development studio. If your team needs custom web apps, tools or automation built to the same fast, privacy-first standard, ByteVancer can help — get in touch to talk through your project.
Recommended reading
Terabyte to Petabyte Converter (TB to PB)
1 terabyte equals 0.001 petabytes. See the TB to PB formula, a table of common values, and convert instantly in your browser.
Terabyte to Megabyte Converter (TB to MB)
1 terabyte equals 1,000,000 megabytes. See the TB to MB formula, a table of common values, and convert instantly in your browser.
Terabyte to Kilobyte Converter (TB to KB)
1 terabyte equals 1,000,000,000 kilobytes. See the TB to KB formula, a table of common values, and convert instantly in your browser.
Terabyte to Gigabyte Converter (TB to GB)
1 terabyte equals 1000 gigabytes. Learn the TB to GB formula, a conversion table of common values, and convert instantly in your browser.