The VCB Calc plugin has been updated and can be downloaded from http://www.drawmetal.com/download-vcb-calc.
In this version, you can extend a previous calculation by entering an operator as the first character after a Result has been obtained.
Also, 'g' is now a reserved word standing for the Golden Ratio. [Due to the differences between the PC and Mac versions, this is a Mac only feature.] For example, entering 3.5 * g = in the VCB (Measurements) box yields the Result 5.6631.

