In 1 bytes there are 1.00000e-12 terabytes. Meanwhile in 1 terabytes there are 1,000,000,000,000 bytes. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Terabytes to Bytes calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert bytes (B) to terabytes (TB), you need to pick the right standard. Storage makers often use decimal (base-10) units, while many computer systems show file sizes in binary (base-2) units.
Decimal terabytes (TB): 1 TB = 1,000,000,000,000 bytes (10¹²)
Formula: TB = bytes ÷ 1,000,000,000,000
Binary tebibytes (TiB) (often shown as “TB” in some apps): 1 TiB = 1,099,511,627,776 bytes (2⁴⁰)
Formula: TiB = bytes ÷ 1,099,511,627,776
Quick examples
If you’re converting for drive sizes, use TB (decimal). If you’re matching what many operating systems report, use TiB (binary).
It depends on which system you use.
Most storage makers use decimal TB on labels. Many operating systems show binary values, even if they say “TB.”
TB means terabyte in the decimal system (base-10).
TiB means tebibyte in the binary system (base-2).
A 1 TB drive is usually sold as 1,000,000,000,000 bytes (decimal). Your computer may report that space using binary units.
In binary terms:
Some space also goes to file system data. That can reduce the usable space a bit more.
Use the decimal formula if you want TB as sold by many drive makers:
Example:
Use the binary formula if you want TiB:
Example:
These are decimal terabytes (TB):
No. It depends on whether the label uses TB (decimal) or TiB (binary).
For decimal terabytes:
This works well for quick estimates.
Internet speeds usually use bits, like Mbps or Gbps. File sizes use bytes, like MB, GB, and TB.
Key point:
A “1 TB download” is about file size in bytes. Your download speed is in bits, so time estimates must convert bits and bytes correctly.
No. A terabyte is a fixed count of bytes.
Compression changes how many bytes a file needs. A compressed file can store the same content using fewer bytes, but 1 TB still equals the same number of bytes based on the unit system you use.
They both use bytes, but they often use different counting systems.
This mix is why “1 TB” can look different depending on what you measure and where you read it.
The Calculate Box tool to convert bytes to terabytes uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a bytes value in the box and have it instantly converted to terabytes.