Without getting in to a debate, I would suggest that you try both formulas out on a known sample and see which one is the more accurate. :-)
If you haven't got Excel you could always pick up a calculator .... :-)
Cheers Guys
Hi, Just to help you guys out with the maths, but you do need Excel !! :-)
Here is how to calculate the ABV without the OG and to calculate the OG all from the final specific Gravity (Hydrometer)and the final specific Gravity (Refractometer in Brix)
Put this formula in to Excel cell C2 to give...