Table 176: SI Base Units and Derived SI Units. Add the SI prexes in Table 177 on page 286 to the SI
Base Units in this table to create compound terms (Derived SI Units). This table contains all the base
units, but only a sampling of derived units. (continued)
Mass kilogram
Time second
Electric Current ampere
Thermodynamic Temperature kelvin
Amount of Substance mole
Luminous Intensity candela
Examples of Derived SI Units
One thousand meters kilometer
Thousandth of a second millisecond
Millionth of an ampere microampere
Table 177: Mathematical power-to-common term comparison (American system). Use these prexes with
the base SI units in Table 176 on page 285 to create compound algebraic and mathematical terms,
called "derived SI units."
Prex Equivalent (American) Ordinal
Number
Mathematical Power
yotta septillion 10
24
zetta sextillion 10
21
exa quintillion 10
18
peta quadrillion 10
15
tera trillion 10
12
giga billion 10
9
mega million 10
6
kilo thousand 10
3
____ ____ 10
milli thousandth 10
–3
micro millionth 10
–6
nano billionth 10
–9
pico trillionth 10
–12
femto quadrillionth 10
–15
atto quintillionth 10
–18
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