Convert Kilobyte to Byte (KB → B)

Converting kilobytes to bytes is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in kilobytes

   Start with the number of kilobytes (KB) you want to convert.
2. 2
   Multiply by 1,000

   The conversion factor from KB to B is 1,000. Multiply your value by this number.
3. 3
   Read the result in bytes

   The result is your value in bytes (B).

Multiply the value in kilobytes by 1,000. For the reverse direction, multiply by 0.001.

• ✓SI: 1 KB = 1000 B. Binary: 1 KB = 1024 B (KiB).
• ✓Storage makers use SI; RAM typically binary.
• ✓Old BIOS messages may show memory as "640K" meaning KiB.

• ✗Assuming 1 KB always = 1024 B — varies by context.
• ✗Confusing KB (storage) with Kb (kilobit, 1/8 of KB).
• ✗Mixing SI and binary without noting which.

What is the Kilobyte?

The kilobyte (KB) equals 1,000 bytes (decimal) or sometimes 1,024 bytes (binary, properly KiB). In modern strict usage, KB = 10³ bytes and KiB = 2¹⁰ bytes, but historical software and operating systems often interchanged them. The kilobyte was the standard file-size unit in early computing: a typical floppy disk held 360–1,440 KB, early word-processor documents were a few KB. Today, the kilobyte is rarely the primary user-facing unit (megabytes and gigabytes dominate), but it remains relevant for small files, source-code text, and embedded systems memory. The original Apple Macintosh (1984) shipped with 128 KB of RAM; the original IBM PC had 16–640 KB. The kilobyte relates to the byte (1,000 bytes = 1 KB decimal, 1,024 bytes = 1 KiB binary), the megabyte (1,000 KB = 1 MB), and the kilobit (1 KB = 8 kbit).

• Small file sizes (icons, short documents)
• Network packet sizes
• Early-computing memory specifications

What is the Byte?

The byte equals 8 bits and is the smallest addressable storage unit in modern computing and digital systems. Byte-sized addresses are universal in computer architectures from microcontrollers to supercomputers, making the byte the fundamental block of memory and storage. A single ASCII character is 1 byte (256 possible values), basic UTF-8 characters use 1–4 bytes, and a UTF-16 character uses 2 bytes. File sizes, RAM capacity, and disk space are all measured in bytes and their multiples. The byte relates to the bit (1 byte = 8 bits), the kilobyte (1,000 or 1,024 bytes — see decimal vs. binary), the kibibyte (1,024 bytes, the strict computing standard), and larger multiples (MB, GB, TB). Note: storage manufacturers use decimal (1 GB = 10⁹ bytes), while operating systems often use binary (1 GiB = 2³⁰ bytes), causing the famous discrepancy where a '1 TB drive' shows about 931 GB free.

• File sizes everywhere (documents, images, video)
• RAM and storage capacity
• Character encoding in programming