CAD tip # 9359:

It is neccessary to keep proper units when processing parameters - supply unitless values to arithmetic functions. So if you e.g. need to calculate a user parameter as a rounded value of another parameter (dimension), with rounding to 2 decimal places, use:

round(d0 / 0.01 mm) * 0.01 mm

The parameter of the function round() is now unitless (originally a length) and the resulting value is converted back to a length value (mm, inches, etc.).

Similarly you can round the values to a different number of decimal places, to tens, hundreds, or also e.g. to multiples of 25mm segments:

round(d0 / 25 mm) * 25 mm