Reference & Information

SI Prefixes Table




Multiple Number Prefix Symbol
1024 1000000000000000000000000 Yotta Y
1021 1000000000000000000000 Zetta Z
1018 1000000000000000000 Exa E
1015 1000000000000000 peta P
1012 1000000000000 tera T
109 1000000000 giga G
106 1000000 mega M
103 1000 kilo k
102 100 hecto h
101 10 deca da
10-1 0.1 deci d
10-2 0.01 centi c
10-3 0.001 milli m
10-6 0.000001 micro µ
10-9 0.000000001 nano n
10-12 0.000000000001 pico p
10-15 0.000000000000001 femto f
10-18 0.000000000000000001 atto a
10-21 0.000000000000000000001 zepto z
10-24 0.000000000000000000000001 yokto y

International System of Units [SI], prefixes

SI prefixes strictly represent powers of 10, they should not be used to represent powers of 2. Thus, one kilobit, or 1 kbit, is 1000 bit and not 210 bit = 1024 bit.


Engineering Symbols
alpha: a, use FONT FACE = "SYMBOL" a
beta: b, use FONT FACE = "SYMBOL" b
epsilon: e, use FONT FACE = "SYMBOL" e
phi: f, use FONT FACE = "SYMBOL" f
pi: p, use FONT FACE = "SYMBOL" p
Omega: W, use FONT FACE = "SYMBOL" W

Note: The Font symbol used above may not work in all browsers
Engineering prefixes are in multiplies of three. 101, 103, 106 and so on [Engineering Notation].

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Last Modified 4/14/10
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