Prefix Symbol Meaning Base Unit Multiplied by Factor
yotta- Y septillion
1,000,000,000,000,000,000,000,000
1024
zetta- Z sextillion
1,000,000,000,000,000,000,000
1021
exa- E quintillion
1,000,000,000,000,000,000
1018
peta-
p quadrillion
1,000,000,000,000,000
1015
tera- T trillion
1,000,000,000,000
1012
giga- g billion
1,000,000,000
109
mega- M million
1,000,000
106
kilo- k thousand
1,000
103
hecto- h hundred
100
102
deca- da ten
10
101
Base units, no prefix - Ex.- meter, liter, gram 100
deci- d tenth
0.1
10-1
centi- c hundredth
0.01
10-2
milli- m thousandth
0.001
10-3
micro- u millionth
0.000001
10-6
nano- n billionth
0.000000001
10-9
pico- p trillionth
0.000000000001
10-12
femto-
f quadrillionth
0.000000000000001
10-15
atto- a quintillionth
0.000000000000000001
10-18
zepto- z sextillionth
0.000000000000000000001
10-21
yocto- y septillionth
0.000000000000000000000001
10-24