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Mechanical Units - Metric & SAE

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.

Name Base Unit Symbol Base Unit Symbol
Length meter m foot ft
Area square meter m2 square foot ft2
Volume cubic meter m3 cubic foot ft3
Mass kilogram kg pound lb
Density kilogram/cubic meter kg/m3 pound/cubic foot lb/ft3
Time second s second s
Speed kilometer/second km/s foot/second ft/s
Force newton N pound-force lbf
Pressure pascal P pound/square foot lb/ft2
Plane Angle radian rad degree °
Solid Angle steradian ster square degree deg2
Momentum kilogram*meter/second r pound*foot/second r
Torque newton/meter t pound-force/foot t
Young's modulus pascal E pascal E
Kinetic energy joule K watt*second K
Potential energy joule U watt*second U