Octal Converter

Convert octal (base-8) numbers to decimal. Enter individual octal digit values. Free octal to decimal converter.

Save

Decimal Value

493

View formula & how it works →

Octal to Decimal Converter

How It Works

Octal (base-8) uses digits 0-7. Each position represents a power of 8:

  • Digit 0: 8^0 = 1
  • Digit 1: 8^1 = 8
  • Digit 2: 8^2 = 64
  • Digit 3: 8^3 = 512
  • Digit 4: 8^4 = 4096
  • Digit 5: 8^5 = 32768

    • Multiply each digit by its place value and sum all the results.

    Example Calculation

    Convert octal 755 to decimal.

    1. 017×64 + 5×8 + 5×1
    2. 02= 448 + 40 + 5
    3. 03= 493 in decimal

    Frequently Asked Questions

    Learn More

    Metric vs Imperial: A Complete Guide to the Two Measurement Systems

    Understand the differences between the metric and imperial measurement systems. Learn their history, how they compare, and when to use each system for length, weight, volume, and temperature.

    Related Calculators

    Binary to Decimal Converter

    Convert binary to decimal.

    Hex to Decimal Converter

    Convert hexadecimal to decimal.