Ounces: Divide by 16 to get the weight in pounds. So, to convert to pounds, you would calculate 18 ounces ÷ 16 = 1.125 pounds. Kilograms: Multiply by 2.2046 to get the weight in pounds. If you have 5 kilograms, that's equal to 5 × 2.2046 = 11.023 pounds.