All numbers in KCL include units, e.g., the number `42` is always '42 mm' or '42 degrees', etc. it is never just '42'. For more information, see [numeric types](/docs/kcl-lang/numeric).
Note that you only need to explicitly convert the units of a number if you need a specific unit for your own calculations. When calling a function, KCL will convert a number to the required units automatically (where possible, and give an error or warning if it's not possible).
