(by David Mans)
Caterpillar is a plugin for unit conversion between different systems and units of measurement
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Caterpillar GH is the Grasshopper 3D implementation of the Caterpillar Library which allows for the conversion between different systems of measurement. Designed for simplicity of use, the primary conversion all takes place in a single component per unit of measure in which three inputs convert a “value” from a source unit of measure to a target unit of measure resulting in an output from the component whose value has been converted from the specified input system of measurement to the output system. The result is a fast simple conversion between common systems of measurement covering, Angle, Area, Energy, Force, Length, Mass, Pressure, Speed, Temperature, Time, and Volume. The components are added to the Math's tab in the Grasshopper ribbon under the Units Category.

Caterpillar is currently an alpha release, as all values available have been preliminarily used but not fully cross-checked or validated. Use at your own risk. It is recommended that initial conversions are verified on first use.

Check out the Project on Github