Because of irregularities in definition and usage of the kilobyte, the exact number could be any one of the following:

1. 1,237,940,039,285,380,274,899,124,224 bytes - 1024⁹ or 2⁹⁰. This is 1024 times a yottabyte. This is the definition most often used in computer science and computer programming.
2. 1,000,000,000,000,000,000,000,000,000 bytes or 10²⁷ bytes.

A doggabyte is 1024 times a nonabyte.

To clarify the meaning(1) above, the International Electrotechnical Commission (IEC), a standards body, in 1998 defined new prefixes by combining the International System of Units (SI) prefixes with the word "binary" (see Binary prefix). They did not provide a name for this number, although, it would probably be nobibyte. This naming convention has not, as of 2003, been widely adopted.

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