Convert Megabyte to Bit (MB → b)

Converting megabytes to bits 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 megabytes

   Start with the number of megabytes (MB) you want to convert.
2. 2
   Multiply by 8,000,000

   The conversion factor from MB to b is 8,000,000. Multiply your value by this number.
3. 3
   Read the result in bits

   The result is your value in bits (b).

Multiply the value in megabytes by 8,000,000. For the reverse direction, multiply by 1.25e-7.

• ✓SI: 1 MB = 1000 KB = 1,000,000 B.
• ✓Binary MiB = 1,048,576 B — 4.86% larger.
• ✓HD drives, networks, SSDs: SI MB.

• ✗Mixing MB and MiB without noting the difference (~5%).
• ✗Confusing MB (storage) with Mb (megabit, 1/8).
• ✗Assuming 1 GB = 1000 MB always — correct in SI; binary it's 1024.

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

What is the Bit?

The bit is the smallest unit of digital information, representing a single binary choice between two states (typically 0 or 1, true or false, on or off). Coined by mathematician John Tukey in 1947 (from 'binary digit'), and formalized by Claude Shannon in his 1948 information theory papers, the bit is the foundation of all modern computing, telecommunications, and information storage. Bit-rates measure data transmission speeds (megabits per second, Mbps, for internet connections), and information-theory entropy is calculated in bits. A single yes/no question carries 1 bit of information; an 8-bit byte represents 256 possible values. The bit relates to the byte (8 bits = 1 byte), the kilobit (1,000 bits = 1 kbit, used in telecom), and the kibibit (1,024 bits = 1 Kibit, used in computing). Modern fiber-optic networks transmit terabits per second.

• Network throughput (bps, Mbps, Gbps)
• Cryptography key lengths (e.g., 256-bit AES)
• Compression algorithms and file header specs