terabyte (decimal) (TB)
1 terabyte (decimal) = 1.000000e+12 bytes
What is terabyte (decimal)?
A terabyte in the decimal system is a data unit equal to 1,000 gigabytes. It is the standard unit used by hard drive and SSD manufacturers, cloud storage providers, and for internet traffic measurement.
Notes: Decimal prefix
Real-world uses
Terabytes are the standard unit for consumer hard drives (1–8 TB), NAS storage, cloud backup plans, and data centre capacity. A 2-hour 4K Blu-ray film uncompressed is about 100 GB; streaming services store thousands of hours of content in terabyte scale. Enterprise databases and analytics platforms operate in the terabyte to petabyte range.
History
The first consumer 1 TB hard drive (Hitachi Deskstar 7K1000) was released in 2007. Since then, drive capacities have grown to 20+ TB. The term "terabyte" saw widespread consumer use from the late 2000s onwards as personal backup and media storage needs grew into this range.
Common mistakes
As with gigabytes, a "1 TB" drive from a manufacturer contains 1,000,000,000,000 bytes (decimal), but Windows reports it as approximately 931 GiB (binary). Users often think storage is missing. 1 TB ≈ 0.909 TiB.
When is this conversion used?
Operating systems and storage manufacturers use different base systems (binary vs decimal), which is why a '1 TB' drive shows less than 1 TB in your file manager. Understanding this conversion prevents confusion about available storage.
How to convert terabyte (decimal) to byte
To convert terabyte (decimal) to byte, multiply the value by 1.000000e+12.
Conversion formula (from base unit)
x * 1000000000000.0
Measurement standards
The International Electrotechnical Commission (IEC 80000-13) defines binary prefixes: 1 KiB = 1,024 bytes, 1 MiB = 1,048,576 bytes. The SI decimal prefixes (kB = 1,000 bytes, MB = 1,000,000 bytes) apply to data units as they do to all SI quantities.
Did you know?
By 2025, the global datasphere is estimated to reach 181 zettabytes — roughly 181 trillion gigabytes. If stored on standard Blu-ray discs, the stack would reach from Earth to Mars and back over 20 times.
| terabytes (decimal) | bytes |
|---|---|
| 0.1 | 1.000000e+11 |
| 0.5 | 5.000000e+11 |
| 1 | 1.000000e+12 |
| 2 | 2.000000e+12 |
| 5 | 5.000000e+12 |
| 10 | 1.000000e+13 |
| 25 | 2.500000e+13 |
| 50 | 5.000000e+13 |
| 100 | 1.000000e+14 |
| 250 | 2.500000e+14 |
| 500 | 5.000000e+14 |
| 1,000 | 1.000000e+15 |
Common values
| terabytes (decimal) | bytes | |
|---|---|---|
| A text email | 5.000000e-09 terabytes (decimal) | 5,000 bytes |
| An MP3 song (4 min) | 0.000004 terabytes (decimal) | 4,000,000 bytes |
| A smartphone photo | 0.000005 terabytes (decimal) | 5,000,000 bytes |
| An HD movie | 0.005 terabytes (decimal) | 5.000000e+09 bytes |
| A full hard drive | 1 terabyte (decimal) | 1.000000e+12 bytes |
Full terabyte (decimal) conversion table
| Unit | Value | Factor |
|---|---|---|
| byte | 1 TB = 1.000000e+12 B | × 1.000000e+12 |
| kilobyte (decimal) | 1 TB = 1.000000e+09 kB | × 1.000000e+09 |
| megabyte (decimal) | 1 TB = 1,000,000 MB | × 1,000,000 |
| gigabyte (decimal) | 1 TB = 1,000 GB | × 1,000 |
| bit | 1 TB = 8.000000e+12 b | × 8.000000e+12 |
| kibibyte (binary) | 1 TB = 976,562,500 KiB | × 976,562,500 |
| mebibyte (binary) | 1 TB = 953,674.31640625 MiB | × 953,674.31640625 |
| gibibyte (binary) | 1 TB = 931.32257462 GiB | × 931.32257462 |
| tebibyte (binary) | 1 TB = 0.9094947 TiB | × 0.9094947 |