Prefix 
Base 10 
Decimal 
Short Scale 
Long Scale 
yotta 
Y 
10^{24} 
1 000 000 000 000 000 000 000 000 
septillion 
quadrillion 
zetta 
Z 
10^{21} 
1 000 000 000 000 000 000 000 
sextillion 
trilliard 
exa 
E 
10^{18} 
1 000 000 000 000 000 000 
quintillion 
trillion 
peta 
P 
10^{15} 
1 000 000 000 000 000 
quadrillion 
billiard 
tera 
T 
10^{12} 
1 000 000 000 000 
trillion 
billion 
giga 
G 
10^{9} 
1 000 000 000 
billion 
milliard 
mega 
M 
10^{6} 
1 000 000 
million 
kilo 
k 
10^{3} 
1 000 
thousand 
hecto 
h 
10^{2} 
100 
hundred 
deca 
da 
10^{1} 
10 
ten 

10^{0} 
1 
one 
deci 
d 
10^{−1} 
0.1 
tenth 
centi 
c 
10^{−2} 
0.01 
hundredth 
milli 
m 
10^{−3} 
0.001 
thousandth 
micro 
μ 
10^{−6} 
0.000 001 
millionth 
nano 
n 
10^{−9} 
0.000 000 001 
billionth 
milliardth 
pico 
p 
10^{−12} 
0.000 000 000 001 
trillionth 
billionth 
femto 
f 
10^{−15} 
0.000 000 000 000 001 
quadrillionth 
billiardth 
atto 
a 
10^{−18} 
0.000 000 000 000 000 001 
quintillionth 
trillionth 
zepto 
z 
10^{−21} 
0.000 000 000 000 000 000 001 
sextillionth 
trilliardth 
yocto 
y 
10^{−24} 
0.000 000 000 000 000 000 000 001 
septillionth 
quadrillionth 