Distance/Length Unit Converter is a simple plugin designed for all the distance converting use-cases. This plugin will convert for you distances/lengths in Kilometers, Meters, Feet, Yards, etc to any unit of your choice.
Once you implement the action in the workflow, you can access the calculations by using 'Result of step 1... action).
You can convert distance/length from:
Kilometers, Meters, Feet, Yards, Miles, Nautical Miles, Centimeters, etc.
Install Distance/Length Unit Converter.
You can pass in the source distance/length as input to the plugin's action and get your results straight away. Note: you would need to use 'Inputs' format as text and use ':converted to number' operator when passing in the values to the action