How do I convert kilobytes to bytes?

Multiply the kilobyte value by 1000. So x kB × 1000 = the equivalent in B.

What is 10 kilobytes in bytes?

10 kilobytes equals 10000 bytes.

What is 100 kilobytes in bytes?

100 kilobytes equals 100000 bytes.

How do I convert back from bytes to kilobytes?

Multiply the byte value by 0.001. For example, 1 B = 0.001 kB.

Is the kilobyte bigger than the byte?

Yes. 1 kilobyte is larger than 1 byte — specifically 1000 times larger.

Are these conversion factors exact?

The factor is derived directly from the SI definitions of kilobyte and byte; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.

Kilobytes to Bytes Converter

1 kB = 1000 B (kilobyte → byte)

1 kB = 1000 B

1 kilobyte equals 1000 bytes. To convert kilobytes to bytes, multiply the kilobyte value by 1000. For quick reference: 1 kB = 1000 B, 5 kB = 5000 B, 10 kB = 10000 B, 100 kB = 100000 B.

From

1000

FormulaBytes = Kilobytes × 1000

Quick

When to use kilobytes → bytes

Kilobytes to bytes multiplies by 1000 (decimal convention) or 1024 if the source actually meant kibibytes — check which your data came from before trusting the result. A '64 kB' EEPROM in embedded hardware almost always means 65 536 bytes (64 × 1024, binary), while a '64 kB' file-size figure from a modern OS almost always means 64 000 bytes (decimal) — the same label, two different real answers depending on context.

Firmware developers allocating a fixed-size buffer from a spec sheet need this exactly: a microcontroller's 32 kB flash page is virtually always 32,768 bytes (binary, ×1024), not 32,000 — embedded hardware specs use the binary convention far more consistently than consumer storage marketing does. Getting this wrong when sizing a bootloader partition either wastes flash or, worse, causes a silent buffer overrun when the last few hundred bytes go unaccounted for.

How to convert kilobytes to bytes

Take your value
Start with your value in kilobytes.
Multiply by 1000
Multiply the kilobyte value by 1000. This is the exact conversion factor from kilobytes to bytes.
Read the result
The product is your value in bytes. For example, 5 kB × 1000 = 5000 B.

Conversion formula

The exact factor from kilobytes to bytes is 1000.

Bytes = Kilobytes × 1000

Kilobytes to Bytes conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from kilobytes to bytes
Kilobytes (kB)	Bytes (B)
1 kB	1000 B
8 kB	8000 B
16 kB	16000 B
64 kB	64000 B
100 kB	100000 B
256 kB	256000 B
500 kB	500000 B
512 kB	512000 B
1000 kB	1000000 B
1024 kB	1024000 B
2000 kB	2000000 B
2048 kB	2048000 B
4096 kB	4096000 B
5000 kB	5000000 B
8192 kB	8192000 B
10000 kB	10000000 B
16384 kB	16384000 B
25000 kB	25000000 B
32768 kB	32768000 B
50000 kB	50000000 B
65536 kB	65536000 B
100000 kB	100000000 B
131072 kB	131072000 B
250000 kB	250000000 B
500000 kB	500000000 B
524288 kB	524288000 B
1000000 kB	1000000000 B
1048576 kB	1048576000 B
2000000 kB	2000000000 B
5000000 kB	5000000000 B
10000000 kB	10000000000 B
50000000 kB	50000000000 B
100000000 kB	100000000000 B
500000000 kB	500000000000 B
1000000000 kB	1000000000000 B
2000000000 kB	2000000000000 B
5000000000 kB	5000000000000 B
10000000000 kB	10000000000000 B
50000000000 kB	50000000000000 B
100000000000 kB	100000000000000 B
500000000000 kB	500000000000000 B
1000000000000 kB	1.0000 × 10^15 B
2000000000000 kB	2.0000 × 10^15 B
5000000000000 kB	5.0000 × 10^15 B
10000000000000 kB	1.0000 × 10^16 B
100000000000000 kB	1.0000 × 10^17 B
1000000000000000 kB	1.0000 × 10^18 B
10000000000000000 kB	1.0000 × 10^19 B
100000000000000000 kB	1.0000 × 10^20 B
1000000000000000000 kB	1.0000 × 10^21 B

Real-world reference

A short text email is around 5–10 kB. A typical web font weight is 30–50 kB. In bytes, that gives you: 1 kB = 1000 B, 10 kB = 10000 B, 100 kB = 100000 B.

Frequently asked questions

How many bytes are in 1 kilobyte?: 1 kilobyte equals 1000 bytes.
How do I convert kilobytes to bytes?: Multiply the kilobyte value by 1000. So x kB × 1000 = the equivalent in B.
What is 5 kilobytes in bytes?: 5 kilobytes equals 5000 bytes.
What is 10 kilobytes in bytes?: 10 kilobytes equals 10000 bytes.
What is 100 kilobytes in bytes?: 100 kilobytes equals 100000 bytes.
How do I convert back from bytes to kilobytes?: Multiply the byte value by 0.001. For example, 1 B = 0.001 kB.
Is the kilobyte bigger than the byte?: Yes. 1 kilobyte is larger than 1 byte — specifically 1000 times larger.
Are these conversion factors exact?: The factor is derived directly from the SI definitions of kilobyte and byte; the displayed value is rounded for readability, and the browser computes using IEEE 754 double-precision arithmetic.

About the kilobyte and the byte

The kilobyte

The kilobyte (kB) equals exactly 1,000 bytes in the SI/IEC decimal convention. Most modern OS file managers and storage-vendor marketing use this definition. Older operating systems (Windows up to Vista) used 1 kB = 1,024 B — that value is now strictly called the kibibyte (KiB).

The byte

A byte is 8 bits — the smallest addressable unit on virtually every modern computer. ASCII text is one byte per character; UTF-8 ranges from 1 to 4 bytes per character.