Decimal value of 101011 binary number Result 101011 = 43 Explained 1 * 25 = 32 0 * 24 = 0 1 * 23 = 8 0 * 22 = 0 1 * 21 = 2 1 * 20 = 1 In result: 32 + 8 + 2 + 1 = 43