KB to Bytes Converter

Convert kilobytes to bytes instantly. Free KB to bytes converter with binary (1024) and decimal (1000) standards for programming and file sizes.

1 KB = 1,024 bytes — used by OS, RAM, file sizes

1 KB =

1,024B

Standard: Binary (1 KB = 1,024 B)

All Units

1 KB in every unit (binary)

Binary vs Decimal

Why your hard drive shows less space

1024
Binary (OS Reports)
1,024 bytes
1000
Decimal (Manufacturer)
1,000 bytes

Difference: 2.3% — this is why a "1 TB" drive shows ~931 GB in your OS

Transfer Time

Estimated time to transfer 1 KB

4G LTE (50 Mbps)< 1 ms
5G (500 Mbps)< 1 ms
Wi-Fi 5 (400 Mbps)< 1 ms
Wi-Fi 6 (1 Gbps)< 1 ms
100 Mbps Broadband< 1 ms
Gigabit Ethernet< 1 ms
USB 2.0 (480 Mbps)< 1 ms
USB 3.0 (5 Gbps)< 1 ms

How to Convert Kilobyte to Byte

Formula with a worked example (binary (1024))

To convert kilobyte (KB) to byte (B), use this formula:

Bytes = KB × 1,024 (binary) or KB × 1,000 (decimal)

Example: Convert 64 KB to B (binary (1024))

64 KB = 65,536 B

To convert back, use: KB = Bytes ÷ 1,024 (binary) or Bytes ÷ 1,000 (decimal)

Kilobyte to Byte Conversion Table

Quick reference (binary (1024))

KBB
0.001 KB1.024 B
0.01 KB10.24 B
0.1 KB102.4 B
0.5 KB512 B
1 KB1,024 B
2 KB2,048 B
5 KB5,120 B
10 KB10,240 B
50 KB51,200 B
100 KB102,400 B

Binary vs Decimal: Which Standard?

Why 1 KB can have two different values in B

There are two ways to define how many byte are in a kilobyte:

Binary (1024-based)

1 KB = 1,024 B

Used by: OS, RAM, file sizes

Decimal (1000-based)

1 KB = 1,000 B

Used by: HDD/SSD manufacturers, networks

When Do You Need KB to B?

Common scenarios where this conversion comes in handy

1

buffer size calculations

2

memory allocation

3

file header analysis

4

protocol packet sizes

Frequently Asked Questions

Common questions about converting kilobyte to byte

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Last updated Mar 24, 2026