Physics reference
SI prefixes
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PhysRef
A comphrensive table of all SI multiples and submultiples.

SI prefixes.
prefixsymbolvalueexpanded valueEnglish name
yottaY10241 000 000 000 000 000 000 000 000U.S. septillion; U.K. quadrillion
zettaZ10211 000 000 000 000 000 000 000U.S. sextillion
exaE10181 000 000 000 000 000 000U.S. quintillion; U.K. trillion
petaP10151 000 000 000 000 000U.S. quadrillion
teraT10121 000 000 000 000U.S. trillion; U.K. billion
gigaG1091 000 000 000U.S. billion
megaM1061 000 000million
kilok1031 000thousand
hectoh102100hundred
decada [footnote 1] 10110ten
1001one
decid10-10.1tenth
centic10-20.01hundredth
millim10-30.001thousandth
microu [footnote 2] 10-60.000 001millionth
nanon10-90.000 000 001U.S. billionth
picop10-120.000 000 000 001U.S. trillionth; U.K. billionth
femtof10-150.000 000 000 000 001U.S. quadrillionth
attoa10-180.000 000 000 000 000 001U.S. quintillionth; U.K. trillionth
zeptoz10-210.000 000 000 000 000 000 001U.S. sextillionth
yoctoy10-240.000 000 000 000 000 000 000 001U.S. septillionth; U.K. quadrillionth
Legend.
prefix
The name of the prefix, which is prepended directly before a unit name with no spaces. For instance, prepending the prefix mega to the SI unit joule gives the word megajoule.
symbol
The symbol of the prefix, to be used in conjunction with the symbol for a unit, following the rules above. For instance, one would write MJ for megajoule.
value, expanded value
The value of the prefix, written in an abbreviated matter and then expanded.
English name
The English name for the unit; if U.S. and U.K. nomenclature differs, then both versions are shown.
Footnotes.
1.
The deca prefix is sometimes written deka and is abbreviated dk. Spellings may vary, but its official symbol is always da, not dk.

footnote 1
2.
The micro prefix is actually represented by the Greek letter mu, but is represented as u throughout these pages.

footnote 2
Cross-references.
Physics reference: Binary prefixes
     A comphrensive table of all binary multiples.
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