KB to Bytes Converter
Convert kilobytes to bytes instantly. One kilobyte equals exactly 1,000 bytes. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert kilobytes to bytes
Worked example: convert 128 kilobytes to bytes. Using bytes ← kilobytes × 1,000, we get 128 × 1,000 = 128,000 B. To check the result, convert back: 128,000 B ÷ 1,000 = 128 KB.
Kilobytes to bytes chart
| Kilobytes (KB) | Bytes (B) |
|---|---|
| 1 KB | 1,000 B |
| 2 KB | 2,000 B |
| 3 KB | 3,000 B |
| 4 KB | 4,000 B |
| 5 KB | 5,000 B |
| 6 KB | 6,000 B |
| 8 KB | 8,000 B |
| 10 KB | 10,000 B |
| 12 KB | 12,000 B |
| 15 KB | 15,000 B |
| 20 KB | 20,000 B |
| 25 KB | 25,000 B |
| 30 KB | 30,000 B |
| 40 KB | 40,000 B |
| 50 KB | 50,000 B |
| 75 KB | 75,000 B |
| 100 KB | 100,000 B |
| 150 KB | 150,000 B |
| 200 KB | 200,000 B |
| 250 KB | 250,000 B |
| 500 KB | 500,000 B |
| 1,000 KB | 1,000,000 B |
Bytes to kilobytes (reverse)
| Bytes (B) | Kilobytes (KB) |
|---|---|
| 1 B | 0.001 KB |
| 2 B | 0.002 KB |
| 5 B | 0.005 KB |
| 10 B | 0.01 KB |
| 20 B | 0.02 KB |
| 50 B | 0.05 KB |
| 100 B | 0.1 KB |
| 250 B | 0.25 KB |
| 500 B | 0.5 KB |
| 1,000 B | 1 KB |
About the kilobyte and the byte
A kilobyte is 1,000 bytes in the decimal (SI) system used by storage makers and macOS. Windows and some tools use 1,024 bytes, which is properly called a kibibyte (KiB).
A byte is 8 bits and the basic unit of digital storage; one plain English character takes one byte. File sizes below 1 KB are shown in bytes.
One kilobyte is 1,000 times the size of one byte, so it takes fewer kilobytes than bytes to express the same amount.
Everyday sizes in kilobytes and bytes
| Everyday example (approximate) | In kilobytes | In bytes |
|---|---|---|
| A short text message | 0.14 KB | 140 B |
| A plain-text email | 5 KB | 5,000 B |
| A web page | 2,000 KB | 2,000,000 B |
| A phone photo | 3,000 KB | 3,000,000 B |
| A 3-minute MP3 song | 5,000 KB | 5,000,000 B |
| A 2-hour HD movie | 3,000,000 KB | 3,000,000,000 B |
Kilobytes to bytes FAQ
How many bytes are in one kilobyte?
One kilobyte equals exactly 1,000 bytes. In the other direction, one byte equals 0.001 kilobytes.
How do I convert kilobytes to bytes without a calculator?
convert 128 kilobytes to bytes. Using bytes ← kilobytes × 1,000, we get 128 × 1,000 = 128,000 B. To check the result, convert back: 128,000 B ÷ 1,000 = 128 KB. For a quick estimate, round the factor to 1,000. Then 128 KB is about 128,000 B, compared with the exact 128,000 B (an error of 0%). That is close enough for planning, but use the calculator above when the number matters.
What is a 2-hour HD movie in bytes?
A 2-hour HD movie is about 3,000,000 kilobytes, which is 3,000,000,000 bytes. Treat that as an approximate everyday figure rather than an official measurement.
Are the kilobytes and bytes the same in every country?
Decimal KB = 1,000 bytes; binary KiB = 1,024 bytes. Windows often labels KiB as KB. A byte is 8 bits everywhere.