Reading a file size
File properties, system commands (such as ls -l) and file managers often report a size in raw bytes. A 51,200 B file is 50 KB — once converted, you know at a glance how big it really is.
Convert bytes to kilobytes
Type a number of bytes and read the result in kilobytes straight away. A kilobyte is 1,024 bytes in the binary system, so the converter divides your value by 1,024. Use Swap order to convert kilobytes to bytes instead.
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Why convert bytes to kilobytes?
A byte is the basic unit of data size, and a kilobyte is 1,024 bytes. Raw sizes in bytes show up in file properties, in the output of system commands and in API responses — converting them to kilobytes makes them easier to read and compare.
The relationship is fixed: 1 KB is 1,024 B in the binary system, which operating systems and this converter use. To turn bytes into kilobytes, divide their number by 1,024. The converter does this the moment you type a value.
Watch out for two systems. In the decimal system (SI), 1 KB is 1,000 B — that is how storage makers count, for example. This converter uses the binary system (1,024 B), matching what Windows and macOS show. Do not mix bytes up with bits either: 1 byte is 8 bits.
This tool computes both standards: binary (1,024) by default, and the Unit standard button switches it to decimal (1,000). Windows and RAM count in binary, while drive makers, macOS and search engines count in decimal — which is why the same capacity is quoted two different ways.
How does the bytes to kilobytes conversion work? Formula and example
The conversion rests on a fixed relationship: one kilobyte is 1,024 bytes. To turn bytes into kilobytes, divide their number by 1,024.
Full formula: kilobytes = bytes ÷ 1,024. The other way: bytes = kilobytes × 1,024.
Example: a file is 51,200 bytes. Calculation: 51,200 ÷ 1,024 = 50 KB. The multiplier 1,024 comes from the fact that computers count in binary, and two to the power of ten is exactly 1,024.
Why 1,024 and not 1,000? In the decimal system (SI), 1 KB is 1,000 B, and that is how storage makers state capacity. Operating systems and this converter use the binary system, where 1 KB is 1,024 B — formally called a kibibyte (KiB).
In Excel, type the formula =A1/1024 in a cell, where A1 holds the value in bytes. The other way, kilobytes to bytes, use =A1*1024.
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Bytes to kilobytes conversion table
The table below converts common byte values into kilobytes in the binary system (÷1,024). To convert another value, use the converter above.
| Bytes | Kilobytes |
|---|---|
| 512 B | 0.5 KB |
| 1,024 B | 1 KB |
| 2,048 B | 2 KB |
| 5,120 B | 5 KB |
| Bytes | Kilobytes |
|---|---|
| 10,240 B | 10 KB |
| 20,480 B | 20 KB |
| 51,200 B | 50 KB |
| 102,400 B | 100 KB |
| Bytes | Kilobytes |
|---|---|
| 256,000 B | 250 KB |
| 512,000 B | 500 KB |
| 1,048,576 B | 1,024 KB |
Example: 1,024 B ÷ 1,024 = 1 KB. Want to convert kilobytes to bytes? Click Swap order in the converter above.
The full data unit ladder: from smallest to largest
Every data size unit grows by the same multiplier: each one is 1,024 times larger than the previous. The table below shows the order from byte to petabyte, with a typical example of what each unit describes.
| Unit | Relationship | Typical example |
|---|---|---|
| Byte (B) | base unit | one character of text |
| Kilobyte (KB) | 1,024 B | a short email or icon |
| Megabyte (MB) | 1,024 KB | a photo or an MP3 song |
| Gigabyte (GB) | 1,024 MB | a movie or a RAM stick |
| Terabyte (TB) | 1,024 GB | a hard drive |
| Petabyte (PB) | 1,024 TB | a large data centre |
Order from smallest to largest: byte, kilobyte, megabyte, gigabyte, terabyte, petabyte. Each step is a multiplication by 1,024.
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When do people most often convert bytes to kilobytes?
Sizes in bytes come up mostly in technical contexts.
Programming and APIs
API responses, the Content-Length header and upload limits are given in bytes. Converting to kilobytes makes it easier to judge whether a 20,480 B (20 KB) response fits your data budget.Small files on a website
Favicons, SVG icons, JSON and CSS files are measured in kilobytes, but tools report them in bytes. Converting helps you keep an eye on asset weight, which affects how fast the site loads.Learning computing
The byte–kilobyte relationship is the basis of many computing exercises. The converter shows plainly that 1 KB is 1,024 B and lets you check your own calculations quickly.
Convert other units to Kilobytes
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Frequently asked questions about converting bytes to kilobytes
How many bytes are in 1 kilobyte?
1 kilobyte is 1,024 bytes in the binary system, which this converter and operating systems use. In the decimal system (SI), used by storage makers among others, 1 KB is 1,000 bytes.
How much is 1024 bytes in KB?
1,024 bytes is exactly 1 KB. Calculation: 1,024 ÷ 1,024 = 1 KB. This is the base relationship between the byte and the kilobyte, which is why it is looked up most often.
How do you convert bytes to kilobytes?
Divide the number of bytes by 1,024. For example, 51,200 B ÷ 1,024 = 50 KB. The converter does this the moment you type a value, with no button to click.
How do you convert kilobytes to bytes?
Multiply the number of kilobytes by 1,024. For example, 10 KB × 1,024 = 10,240 B. Click Swap order to have the converter work in this direction.
Is 1 KB 1,000 or 1,024 bytes?
It depends on the system. Operating systems and this converter use the binary system, where 1 KB is 1,024 B. Storage makers use the decimal system, where 1 KB is 1,000 B. That is why the same number of bytes can give a slightly different result in KB.
What is the difference between KB and KiB?
KiB (kibibyte, the IEC standard) is always exactly 1,024 B. KB in the SI system is 1,000 B. In everyday use most people write KB while meaning 1,024 B, which is technically KiB. This converter uses 1,024 B.
How many bits are in a byte?
1 byte is 8 bits. Mind the notation: KB means kilobytes (file size), while Kb means kilobits (often transfer speed). This tool works with bytes and kilobytes, not bits.
How do you convert B to KB in Excel?
Type the formula =A1/1024 in a cell, where A1 holds the value in bytes. The other way, kilobytes to bytes, use =A1*1024. The same formula works in Google Sheets.
What is the order of the units from smallest to largest?
From smallest: byte (B), kilobyte (KB), megabyte (MB), gigabyte (GB), terabyte (TB), petabyte (PB). Each unit is 1,024 times larger than the previous one. A byte describes a single character, while a terabyte describes a drive capacity.
Have a question or suggestion?
If you have spotted an error in the table or have an idea to improve the converter, write to us. We reply to every message.
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