It looks like it has the SG conversions on there already. I would imagine you would not have to convert from brix to sg because it is on the scale there. However, you still would have to convert your readings after fermentation has begun. Morebeer has a spreadsheet I believe. IMHO, if you have to convert anyway, I say save the 30 bucks get the cheaper one and get a few lbs of hops or something.