Here is a collection of some of the most often used mechanical units. Both SI
(metric) and SAE (English) units are given.
There are two fundamental types of units: base units and derived units. Base
units include meter, foot, kilogram, second, etc. Derived units involve a combination
of base units, such as square meter, kilometer/second, etc.
Length 
meter 
m 
foot 
ft 
Area 
square meter 
m^{2} 
square foot 
ft^{2} 
Volume 
cubic meter 
m^{3} 
cubic foot 
ft^{3} 
Mass 
kilogram 
kg 
pound mass 
lb 
Density 
kilogram/cubic meter 
kg/m^{3} 
pound/cubic foot 
lb/ft^{3} 
Time 
second 
s 
second 
s 
Speed 
kilometer/second 
km/s 
foot/second 
ft/s 
Force 
newton 
N 
poundforce 
lbf 
Pressure 
pascal 
P 
pound/square foot 
lb/ft^{2} 
Plane Angle 
radian 
rad 
degree 
° 
Solid Angle 
steradian 
ster 
square degree 
deg^{2} 
Momentum 
kilogram*meter/second 
ρ 
pound*foot/second 
ρ 
Torque 
newton*meter 
t 
poundforce*foot 
t 
Young's modulus 
pascal 
E 
pascal 
E 
Kinetic energy 
joule 
K 
watt*second 
K 
Potential energy 
joule 
U 
watt*second 
U 
Here is the NIST document entitled The
International System of Units (SI) –Conversion Factors for General Use
