Convert Kilobyte to Megabyte (KB → MB)

Converting kilobytes to megabytes 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 0.001

   The conversion factor from KB to MB is 0.001. Multiply your value by this number.
3. 3
   Read the result in megabytes

   The result is your value in megabytes (MB).

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

• ✓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 Megabyte?

The megabyte (MB) equals 1,000 kilobytes (1,000,000 bytes decimal, or 1,048,576 bytes binary as MiB). It is the everyday unit for image files, MP3 songs, and small documents on personal computers. A high-quality JPEG photograph is 2–10 MB, an MP3 song is 3–10 MB, a Microsoft Word document might be 0.05–5 MB, and a typical e-book is under 5 MB. Older USB flash drives and CDs hold hundreds of MB (a CD is 700 MB). Mobile data plans were originally measured in MB before gigabyte plans became standard. The megabyte relates to the kilobyte (1,000 KB = 1 MB), the gigabyte (1,000 MB = 1 GB), and the megabit (1 MB = 8 Mbit). Internet connection speeds are usually rated in Mbps (megabits per second), distinct from MBps (megabytes per second): 100 Mbps = 12.5 MBps.

• Photo and image file sizes
• MP3 and audio files
• Small video clips