SI Prefix Reference

From quetta (Q, 10³⁰) down to quecto (q, 10⁻³⁰).

PrefixSymbolFactor
quettaQ1030
ronnaR1027
yottaY1024
zettaZ1021
exaE1018
petaP1015
teraT1012
gigaG109
megaM106
kilok103
hectoh102
decada101
(base)100
decid10-1
centic10-2
millim10-3
microµ10-6
nanon10-9
picop10-12
femtof10-15
attoa10-18
zeptoz10-21
yoctoy10-24
rontor10-27
quectoq10-30

About this tool

Reference for all SI metric prefixes including the 2022 additions (ronna, quetta, ronto, quecto).

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