SI Unit (Metric) Prefixes

Greek prefixes indicate a unit greater than the base unit; Latin prefixes indicate a unit smaller than the base unit. Those above the dashed line in the table below are Greek prefixes and those below the dashed line are Latin prefixes.

Prefix

Symbol

Numeric Multiplier

Sci. Not Form

tera

T

1 000 000 000 000

1 x 10 12

giga

G

1 000 000 000

1 x 10 9

mega

M

1 000 000

1 x 10 6

kilo

k

1 000

1 x 10 3

hecto

h

100

1 x 10 2

deka

da

10

1 x 10 1

******

******

1

1 x 10 0

deci

d

0.1

1 x 10 -1

centi

c

0.01

1 x 10 -2

milli

m

0.001

1 x 10 -3

micro

µ

0.000 001

1 x 10 -6

nano

n

0.000 000 001

1 x 10 -9

pico

p

0.000 000 000 001

1 x 10 -12