Octal to Decimal
ConvertersConvert octal numbers (base-8) to decimal (base-10).
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Decimal (Base-10)
About This Tool
Easily translate base-8 octal values into the familiar base-10 decimal system. Frequently used in Unix file permission analysis and legacy computing.
Frequently Asked Questions
The octal system is base-8 and uses digits from 0 to 7. It was widely used in early mainframe computers and is still common today for representing Unix file permissions.
Multiply each digit by 8 raised to the power of its position (starting from 0 on the right) and sum the results. For example, 12 in octal is (1*8) + (2*1) = 10 in decimal.
Linux/Unix uses octal to set file permissions (chmod). For example, 755 represents read, write, and execute permissions for the owner, and read/execute for others.
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