The Unit Conversion Library below contains calculators and formulas for converting between units.  vCalc has over 500 unit types (e.g. kilograms, Newtons and Light Years) in over 50 unit categories including length, area, volume, volumetric flow, velocity, acceleration, mass, force, energy, and many more.  For most conversions, use the Unit Conversion Calculator (CLICK HERE).   Choose your category and enter the input value in the units you choose, the result let you toggle your answer to any of the compatible units (e.g. miles per hour to centimeters per second)