Even though it's unlikely that the "K" used as kelvin and the "K" improperly used as kilo- might be confused, the latter is wrong. In SI the "K" symbol represent the kelvin, a unit of temperature. (for instance, a nanometer is equal to 0.000000001 metres or 1 m × 10⁻⁹ and its symbol is "nm") but since they are not often used in computing we won't discuss about them.Īll the prefixes shown in the previous table are written in the upper-case form except the "k". To denote the submultiples of the units of measure, there are also other SI prefixes with a negative power of 10, such as milli-, micro-, nano-, etc. ** Note that only the "kilo-" prefix has a lowercase symbol ('k'). Kilo- means ×1000 or ×10³ and its symbol is "k" (lower-case letter 'k'), thus a km is equal to 1000 metres (or 1 m × 10³).Įvery decimal prefix denotes a specific power of 10 and has a name and a symbol, as shown in the following table: The SI prefixes* * Only the prefixes that denote positive powers of 10 are listed in this table. The International System of Units (abbreviated SI) defines a set of prefixes, with an associated symbol, to represent multiples (or submultiples) of a unit of measure.įor example, the kilo- prefix can be combined with the unit metre to form "kilometre". Differences between Decimal and Binary Prefixes.Binary Prefixes - The IEEE 1541 standard.This article explains what decimal and binary prefixes are, when they should be used, what are the differences between them and how they are used with hardware and software.
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