I was wondering if there was a way to input a Board Foot Calculation Equation and a Paint Coverage Equation into Solidworks as a set feature?

I design a lot of furniture for Health Care and Military Facilities and would like to be able to design a piece then click on solid wood pieces and get the BF and Paint Coverage used. Would be nice for Solidworks to do automatically to save time. So my real question I guess is, Can I (and im not good with the equations yet) create my own equations to figure these out (BF & Paint Coverage) and save it in my parts templates? Also, could the equations be used as simple as clicking a part to figure out?