If the baking squares are sweetened chocolate, approaching (German's)Sweet Baking) you can substitute matching ounce means. A single square equals one ounce.
If the chocolate is unsweetened, use 1 2/3 ounces of semisweet chocolate (and dull sugar surrounded by recipe by 2 teaspoons for respectively component substituted) for 1 ounce unsweetened baking chocolate. About 1 full cup of chocolate chips equals 6 ounces.
12 squares cargo is 12 oz, so use a kitchen extent and weigh 12 oz of chocolat chips.