Bytes (B) to Kilobytes (KB) Converter
Enter your Bytes (B) value to convert to Kilobytes (KB). 1 B = 0.001 KB, calculated across both decimal (SI) and binary (IEC) standards.
Convert Bytes to Kilobytes
Do you want to convert kilobytes to bytes?
How to Convert Bytes to Kilobytes
To convert bytes to kilobytes, divide by 1,000. This gives you the equivalent storage size in the target unit. Check out our Kilobytes to Bytes.
B: A byte consists of 8 bits and is the standard unit for measuring digital storage. One byte can represent 256 different values (0-255). Use our Bytes to Zebibytes converter.
KB: A kilobyte is 1,000 bytes using the SI decimal standard. Commonly used for small file sizes. See also: Tebibytes to Kilobytes calculator.
1 B = 0.001 KB (using SI decimal standard) — or equivalently, 1 KB = 1,000B.
B to KB Conversion Formula
// Convert B to KB
KB = B × 0.001
// Reverse: Convert KB to B
B = KB × 1,000
B to KB Conversion Examples
100 B = 0.1 KB
256 B = 0.256 KB
500 B = 0.5 KB
1,000 B = 1 KB
2,048 B = 2.048 KB
What Is a Byte?
A byte consists of 8 bits and is the standard unit for measuring digital storage. One byte can represent 256 different values (0-255). Check out our convert Tebibytes to Mebibits.
The byte is a fundamental unit of digital information storage. It uses base 1,000 following the SI (International System of Units) standard. Learn more: Yottabytes Per Second to Kibibytes Per Second conversion.
Common uses: File sizes, memory addressing, character encoding (ASCII, UTF-8) Try the B to Tebibits converter.
1 B = 8 bits = 1 bytes.
The byte can be abbreviated as B; for example, 1 byte can be written as 1 B.
What Is a Kilobyte?
A kilobyte is 1,000 bytes using the SI decimal standard. Commonly used for small file sizes. Related: Pebibits to KB calculator.
The kilobyte is a SI decimal unit of digital information storage. It uses base 1,000 following the SI (International System of Units) standard. Learn more: convert EiB to Zebibytes.
Common uses: Text documents, small images, email attachments, configuration files Try the Kilobytes Per Second to PiB/s.
1 KB = 8,000 bits = 1,000 bytes.
The kilobyte can be abbreviated as KB; for example, 1 kilobyte can be written as 1 KB.
Byte to Kilobyte Conversion Table
The table below shows various byte measurements converted to kilobytes.
| Bytes | Kilobytes |
|---|---|
| 1 B | 0.001 KB |
| 2 B | 0.002 KB |
| 5 B | 0.005 KB |
| 10 B | 0.01 KB |
| 25 B | 0.025 KB |
| 50 B | 0.05 KB |
| 100 B | 0.1 KB |
| 128 B | 0.128 KB |
| 250 B | 0.25 KB |
| 256 B | 0.256 KB |
| 500 B | 0.5 KB |
| 512 B | 0.512 KB |
| 1,000 B | 1 KB |
| 1,024 B | 1.024 KB |
SI Decimal vs Binary: Why Two Different Standards?
When converting bytes to kilobytes, different tools may give slightly different results. This is because there are two competing standards for measuring digital storage:
| Standard | Base | 1 KB equals | Used By |
|---|---|---|---|
| SI Decimal | 1000 | 1,000 bytes | Hard drive manufacturers, macOS, network speeds |
| Binary (IEC) | 1024 | 1,024 bytes | Windows, Linux (partially), RAM specifications |
Why Does My Hard Drive Show Less Space Than Advertised?
This difference in standards explains the common "missing hard drive space" confusion.
Example: A "500 GB" Hard Drive
- Contains exactly: 500,000,000,000 bytes
- macOS (SI Decimal): Displays 500 GB (divides by 1,000³)
- Windows (Binary): Displays 465 GB (divides by 1,024³)
The Verdict: Same bytes, same drive—just different math. No space is actually missing.
Note: Our calculator defaults to SI decimal (base 1000) to match the box label. To match Windows, toggle the standard at the top of the calculator.
💡 Storage Engineer Tip
For accurate capacity planning, always verify whether specifications use SI decimal (base 1000) or binary (base 1024) units. The difference becomes significant at larger scales.
— Subash Geetha Krishnan, 15+ years in enterprise storage
When to Convert B to KB
Common scenario: Planning storage allocation, comparing specifications, or converting between byte and kilobyte for capacity planning. Try the how many Gb in Bytes.
Other situations include storage planning for calculating how much data fits in a given capacity, file management for understanding sizes across different scales, cost estimation for budgeting cloud storage, and backup planning for determining media requirements. Check out our Kib to KB calculator.