SI - Prefixes

The International System of Units (SI): Prefixes

Decimal multiples and submultiples of SI units

 

Decimal multiples and submultiples of SI units can be written using the SI prefixes listed below:

 

Name Symbol Multiplying factor

quetta

Q

 1030

ronna

R

 1027

yotta

Y

 1024

zetta

Z

 1021

exa

E

 1018

peta

P

 1015

tera

T

 1012

giga

G

 109

mega

M

 106

kilo

k

 103

hecto

h

 102

deca

da

 101

deci

d

 10–1

centi

c

 10–2

milli

m

 10–3

micro

µ

 10–6

nano

n

 10–9

pico

p

 10–12

femto

f

 10–15

atto

a

 10–18

zepto

z

 10–21

yocto

y

 10–24

ronto

r

 10–27

quecto

q

 10–30

 

See:

SI Brochure

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Resolutions/Recommendations

CGPM Resolution 3 (2022)

On the extension of the range of SI prefixes

DOI : 10.59161/CGPM2022RES3E

CGPM Resolution 4 (1991)

SI prefixes zetta, zepto, yotta and yocto

DOI : 10.59161/CGPM1991RES4E

CGPM Resolution 10 (1975)

SI prefixes peta and exa

DOI : 10.59161/CGPM1975RES10E

CGPM Resolution 8 (1964)

SI prefixes femto and atto

DOI : 10.59161/CGPM1964RES8E

CGPM Resolution 12 (1960)

Système International d'Unités

DOI : 10.59161/CGPM1960RES12E