BRAVO TECHNOLOGY CENTER

Bravo Reference: SI Prefixes & Symbols  by Sam C. Chan
First Published: 2004
Updated: Feb. 12, 2015
 
Scientific
Notation
Spelled out in Full

English
 Words

SI
Prefix
SI
Symbol
1.0E+36
1.0E+33
1.0E+30
1.0E+27
1.0E+24
1.0E+21
1.0E+18
1.0E+15
1.0E+12
1.0E+9
1.0E+6
1.0E+3
1.0E+2
1.0E+1
1.0E-1
1.0E-2
1.0E-3
1.0E-6
1.0E-9
1.0E-12
1.0E-15
1.0E-18
1.0E-21
1.0E-24

1 000 000 000 000 000 000 000 000 000 000 000 000
1 000 000 000 000 000 000 000 000 000 000 000
1 000 000 000 000 000 000 000 000 000 000
1 000 000 000 000 000 000 000 000 000
1 000 000 000 000 000 000 000 000
1 000 000 000 000 000 000 000
1 000 000 000 000 000 000
1 000 000 000 000 000
1 000 000 000 000
1 000 000 000
1 000 000
1 000
100
10
0.1
0.01
0.001
0.000 001
0.000 000 001
0.000 000 000 001
0.000 000 000 000 001
0.000 000 000 000 000 001
0.000 000 000 000 000 000 001
0.000 000 000 000 000 000 000 001

undecillion (11)
decillion
(10)
nonillion
(9)
octillion
(8)
septillion
(7)
sextillion
(6)
quintillion
(5)
quadrillion
(4)
trillion
(3)
billion
(2)
million
(1)
thousand
hundred
ten
tenth
hundredth
thousandth
millionth
billionth
trillionth
quadrillionth
quintillionth
sextillionth
septillionth




yotta
zetta
exa
peta
tera
giga
mega
kilo
hecto
deca
deci
centi
milli
micro
nano
pico
femto
atto
zepto
yocto




Y
Z
E
P
T
G
M
k
h
da
d
c
m

n
p
f
a
z
y

Note: The scientific English words here are based on the French short scale system adopted by United States (commonly referred to as the "American" system), as opposed to the French long scale system (commonly known as the "British" system).  The everyday words thousand, hundred and ten have Germanic roots, whereas words starting from million and up, all have French (ultimately Latin) origins. See: A Billion is a Billion? for more details.

 
  Binary Decimal Approx. Examples
K 2^10 1,024 > 10^3  
  2^16 65,536 < 10^6 Hi color
M 2^20 1,048,576 > 10^6  
  2^24 16,777,216 > 10^7 True color
G 2^30 1,073,741,824 > 10^9  
  2^32 4,294,967,296 > 10^9 IPv4
T 2^40 1,099,511,627,776 > 10^12  
P 2^50 1,125,899,906,842,624 > 10^15  
  2^64 18,446,744,073,709,551,616 > 10^18 x64 address
  2^128 3.4028236692093846346337460743177e+38 > 10^38 IPv6

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