In 1 terabytes there are 1,000,000,000,000 bytes. Meanwhile in 1 bytes there are 1.00000e-12 terabytes. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Bytes to Terabytes calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert terabytes (TB) to bytes (B), multiply by the right power of 10 or 2. The key is knowing which TB your storage label uses.
Decimal terabyte (TB, base-10): 1 TB = 1,000,000,000,000 bytes (10¹² B)
Binary terabyte (often shown as TiB, base-2): 1 TiB = 1,099,511,627,776 bytes (2⁴⁰ B)
Tip: Drives often use TB (base-10), while some systems report sizes closer to TiB (base-2).
It depends on the system you use.
Storage makers often use decimal TB. Many operating systems show size using binary units.
TB (terabyte) is usually decimal. TiB (tebibyte) is binary.
That difference is about 9.95%, so the numbers can look off when you compare labels to what your computer shows.
Drive labels often use decimal TB (1,000,000,000,000 bytes). Many systems report space in binary units (TiB) but may still display it as “TB” or “GB.”
So a “1 TB” drive is:
Some space is also used for formatting and file system data, which can lower the visible total a bit more.
Use the right multiplier for your unit.
Example (decimal):
2.5 TB = 2.5 × 1,000,000,000,000 = 2,500,000,000,000 bytes
Not in decimal units.
In bytes:
In decimal units:
In binary (0.5 TiB):
In decimal units:
In binary (2 TiB):
Again, choose decimal or binary.
Example (decimal):
3,000,000,000,000 bytes ÷ 1,000,000,000,000 = 3 TB
Both show up, which causes mix-ups.
If you need exact bytes, check whether the context uses TB (decimal) or TiB (binary).
1 TiB is bigger.
Difference:
Use TB to bytes for:
Use TiB to bytes for:
If the source says “1024,” it’s usually binary.
No. The word “terabyte” is used two ways in everyday use:
For clear results, state the unit system and show the byte count.
The Calculate Box tool to convert terabytes to bytes uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a terabytes value in the box and have it instantly converted to bytes.