Prefix

Symbol

Factor

Decimal Value

yotta

Y

1024

1,000,000,000,000,000,000,000,000

zetta

Z

1021

1,000,000,000,000,000,000,000
exbi Ei 260 1,152,921,504,606,846,976

exa

E

1018

1,000,000,000,000,000,000
pebi Pi 250 1,125,899,906,842,624

peta

P

1015

1,000,000,000,000,000
tebi Ti 240 1,099,511,627,776

tera

T

1012

1,000,000,000,000
gibi Gi 230 1,073,741,824

giga

G

109

1,000,000,000
mebi Mi 220 1,048,576

mega

M

106

1,000,000
kibi ki

210

1,024

kilo

k

103 1,000

hecto

h

102

100

deka

da

101

10
uni - 100 1

deci

d

10-1

0.1

centi

c

10-2

0.01

milli

m

10-3

0.001

micro

mu or u

10-6

0.000001

nano

n

10-9

0.000000001

pico

p

10-12

0.000000000001

femto

f

10-15

0.000000000000001

atto

a

10-18

0.000000000000000001

zepto

z

10-21

0.000000000000000000001

yocto

y

10-24

0.000000000000000000000001

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 This page last updated on August 05, 2010