Terabytes to Exbibytes (TB to EiB)

1 terabyte equals 8.67361738×10⁻⁷ exbibytes (rounded).

How to convert terabytes to exbibytes

To convert terabytes to exbibytes, multiply the number of terabytes by 8.67361738×10⁻⁷. The factor is rounded to 10 significant digits. To go the other way, multiply exbibytes by 1,152,921.505 (rounded).

exbibytes = terabytes × 8.67361738×10⁻⁷

Example: 10 terabytes = 0.00000867361738 exbibytes.

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

Terabyte (TB)

ComputingCurrent unit

1,000 gigabytes (10¹² bytes), the capacity of a typical modern hard drive.

Tera comes from the SI prefix for 10 to the twelfth, so a terabyte is one million million bytes. Computer memory is binary, so the prefixes were once used for powers of two, which caused confusion. IUPAC proposed binary prefixes such as kibi, mebi and gibi in 1995, and the IEC adopted them in December 1998 and published the standard in January 1999. The tebibyte is the binary counterpart, about 9 percent larger than the terabyte.

Hitachi introduced the first one-terabyte consumer hard drive in 2007. For scale, one terabyte is about 20 standard Blu-ray discs or 213 DVDs. The mismatch shows at this size: a drive sold as 1 TB may be reported as about 931 GB, because Windows uses the historic binary convention. macOS and iOS did the same until Mac OS X 10.5 Leopard and iOS 10, then switched to powers of 10.

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

Sources: Wikipedia: Terabyte; Wikipedia: Binary prefix; NIST: Prefixes for binary multiples

Exbibyte (EiB)

ComputingCurrent unit

Exactly 2⁶⁰ bytes (about 1.153 exabytes).

Exbi joins the first two letters of exa to bi, for binary, and was published by the IEC in January 1999 with pebi. An exbibyte (EiB) is exactly 2^60 bytes, which is 1,152,921,504,606,846,976 bytes, or 1,024 pebibytes. NIST's page on binary prefixes lists it as the largest of the six original binary multiples.

The decimal exabyte is 10^18 bytes, so the exbibyte is about 15.3 percent larger. A useful landmark is the address space of a 64-bit machine, which can in principle reach 2^64 distinct byte addresses, or 16 exbibytes, a figure that has no neat decimal equivalent.

Real systems seldom approach this size, so the unit appears mostly in discussions of addressing and capacity limits. Like the other IEC names, it states plainly that the count is binary.

1 exbibyte = 1.152921505×10¹⁸ bytes (approximately).

Sources: NIST: Prefixes for binary multiples; Wikipedia: Binary prefix; Wikipedia: Byte

Related conversions

See all digital storage units.