So a freind and i brewed a choc. coffee stout yesterday and our gravity was 1.092. Which was high so we added a half gallon of water to it. We didn't take a gravity after doing so. It was put into a 6.5 carboy and yeast was already in and figured reading wouldn't be complety acurate. And that there is a way to figure out what aprox. it will be. Does anyone know what calculator.