Terabytes to Megabits Converter

Terabytes to Megabits

Convert terabytes (TB) to megabits (Mb). Both measure digital storage, and the conversion comes up in computing, storage, internet work.

The Formula

`` megabits = terabytes × 8000000 terabytes = megabits × 1.25e-7 `

One terabyte is 8,000,000 megabits, and one megabit is 1.2500e-7 terabytes.

Conversion Table

Terabytes	Megabits
1 TB	8,000,000 Mb
2 TB	16,000,000 Mb
5 TB	40,000,000 Mb
10 TB	80,000,000 Mb
25 TB	200,000,000 Mb
50 TB	400,000,000 Mb
100 TB	800,000,000 Mb
500 TB	4,000,000,000 Mb
1,000 TB	8,000,000,000 Mb

The Other Direction

Megabits	Terabytes
1 Mb	1.2500e-7 TB
2 Mb	2.5000e-7 TB
5 Mb	6.2500e-7 TB
10 Mb	1.2500e-6 TB
25 Mb	3.1250e-6 TB
50 Mb	6.2500e-6 TB
100 Mb	1.2500e-5 TB
500 Mb	6.2500e-5 TB
1,000 Mb	1.2500e-4 TB

What Each Unit Is

Terabytes (TB) — 1,000,000,000,000 bytes in decimal usage. The unit of consumer drives since the late 2000s.

Megabits (Mb) — 1,000,000 bits. The unit internet plans are sold in — deliberately, because it makes the number eight times larger.

A Sense of Scale

• A 1 TB drive shows as 931 GiB in Windows
• A 4K film master is several TB
• HD streaming needs 5 Mbit/s
• 100 Mbit/s downloads at about 12.5 MB/s

Precision

The factor 8000000 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.

Watch Out For

• Mb is megabits, MB is megabytes. A 100 Mbps connection delivers roughly 12.5 MB/s, not 100.

In Code

`javascript const terabyteToMegabit = (value) => value * 8000000; ``

Where This Conversion Comes Up

• Computing
• Storage
• Internet
• Media
• Backups

How Many Decimals Do You Need?

Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 TB with the factor truncated at each decimal place:

Decimals kept	Factor	137 TB becomes	Error
0	8000000	1,096,000,000	—
1	8000000	1,096,000,000	—
2	8000000	1,096,000,000	—
3	8000000	1,096,000,000	—
4	8000000	1,096,000,000	—

A rule that holds for any conversion: round once, at the end. Rounding the factor and then multiplying compounds the error through every subsequent calculation, while carrying full precision and rounding the final answer does not.

The right number of significant figures is set by your input, not by the converter. If you measured terabytes to three significant figures, the answer in megabits is only good to three — writing more digits claims precision the measurement never had.