Terabits to Megabytes (Tb to MB)

1 terabit equals 125,000 megabytes exactly.

How to convert terabits to megabytes

To convert terabits to megabytes, multiply the number of terabits by 125,000. This factor is exact. To go the other way, multiply megabytes by 0.000008.

megabytes = terabits × 125,000

Example: 10 terabits = 1,250,000 megabytes.

Decimal prefixes (kB, MB, GB) are powers of 1,000; binary prefixes (KiB, MiB, GiB) are powers of 1,024. Storage makers use decimal; Windows reports binary but labels it GB.

About these units

Terabit (Tb)

ComputingCurrent unit

10¹² bits (125 GB).

Network engineers reach for the terabit because link speeds are quoted in bits per second, and Wikipedia's article on the bit confirms that transfer rates conventionally use decimal SI multiples. One terabit is exactly 10^12 bits, which at eight bits per byte is 125,000,000,000 bytes, or 125 gigabytes. Tera, adopted into the SI in 1960, is the first prefix after giga.

The commonly used symbol is Tbit, and the IEEE 1541 standard recommends lowercase b, giving Tb. That shorthand is risky because capital B means byte, a factor of eight apart. In the IEC naming, a terabit is a decimal unit; its binary counterpart, the tebibit, is 2^40 bits, about 10 percent larger.

Because it is quoted in bits, the terabit suits data rates, where terabits per second describe very high-capacity links, and it is eight times smaller than the terabyte.

1 terabit = 125,000,000,000 bytes (exactly).

Sources: Wikipedia: Bit; Wikipedia: Metric prefix; Wikipedia: Binary prefix

Megabyte (MB)

ComputingCurrent unit

1,000,000 bytes (decimal). A typical MP3 song is 3–5 MB; a smartphone photo is 2–5 MB.

Megabyte started out as informal jargon. Base-1,024 usage grew because 1,024 is close to 1,000 and convenient for binary multiples. In 1999 the IEC standardized binary prefixes, assigning megabyte to 10 to the sixth bytes and mebibyte to 2 to the twentieth. By the end of 2009 the IEEE, the EU, ISO and NIST had adopted that standard, though the word still carries different meanings in practice.

The famous 1.44 MB floppy disk is a mixed case: it counts 1,024,000 bytes per megabyte, and it actually holds 1,474,560 bytes. Today most storage media and networking use the decimal definition, while Windows uses the binary one for memory such as RAM. For scale, a PlayStation 2 memory card held 8 MB, the plain text of Moby Dick runs to 1.192 MB, and one megabyte holds about one minute of 128 kbit/s MP3 audio.

1 megabyte = 1,000,000 bytes (exactly).

Sources: Wikipedia: Megabyte; NIST: Prefixes for binary multiples

Related conversions

See all digital storage units.