Prefix Symbol Exponential Word Number (multiply by)
yocto y 10-24 septillionth 0.000 000 000 000 000 000 000 001
zepto z 10-21 sextillionth 0.000 000 000 000 000 000 001
atto a 10-18 quintillionth 0.000 000 000 000 000 001
femto f 10-15 quadrillionth 0.000 000 000 000 001
pico- p 10-12 trillionth 0.000 000 000 001
nano- n 10-9 billionth 0.000 000 001
micro- μ 10-6 millionth 0.000 001
milli- m 10-3 thousandth 0.001
centi- c 10-2 hundredth 0.01
deci- d 10-1 tenth 0.1
0
deca- d 10 ten 10
hecto- h 102 hundred 100
kilo- k 103 thousand 1000
mega- M 106 million 1,000,000
giga- G 109 billion 1,000,000,000
tera- T 1012 trillion 1,000,000,000,000
peta- P 1015 quadrillion 1,000,000,000,000,000
exa- E 1018 quintillion 1,000,000,000,000,000,000
zetta Z 1021 sextillion 1,000,000,000,000,000,000,000
yotta Y 1024 septillion 1,000,000,000,000,000,000,000,000
Some comparisons . . .
A meter is about the length of a person's arm.
A nanometer is one billionth of a meter. Think of it this way: There are as many nanometers in an inch as there are inches in 400 miles.
An ant's eye is about 50 micrometers.
The dime is about 1 millimeter thick. (A millimeter is one million times larger than a nanometer!)
A centimeter is about the width of a popsicle stick.
Mega comes from the Greek megasmeaning "great, large, or mighty."
Giga is from the Greek gigas meaning "giant."
Kilo comes from the Greek khilioimeaning 1,000.
The Earth has a mass of approximately 6000 Yottagrams!
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