Octal-to-Decimal Conversion

The decimal equivalent of the octal number (131.21)8 is determined as follows,
• The integer part = 131
• The decimal equivalent = 1 × 8^0 + 3 × 8^1 + 1 × 8^2 = 1 + 24 + 64 = 89

• The fractional part = 0.21
• The decimal equivalent = 2 × 8^−1 + 1 × 8^−2 = 0.265
• Therefore, the decimal equivalent of (131.21)8
= (89.265)10

All About Basic Electronics