A rough conversion from brix to specific gravity is to multiply the brix by 4 then add 1000 and then divide by 1000. For example, if brix = 16, then 16 x 4 = 64, add 1000 = 1064, then divide by 1000 = 1.064. Also, I calibrate my refractometer to my hydrometer by taking one or two comparison...