Well, you are trying to put a decimal(4,2) that you have appended a % to into an int column. That won't work for a couple of reasons. First an int can't have any decimal places. Second you added a non-numeric character in there, so it is a varchar that can't be converted to an int anyways. Do you really need the % in there? If not, make @percent a decimal(4,2), or (5,2) if it can be 100% and get rid of the converts when you are setting the value.