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 |