Octal to Decimal Converter

Quickly convert octal numbers to decimal numbers, supporting single conversion, batch conversion, and file conversion, with detailed conversion steps and formulas displayed.

Bug report

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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Tool Usage

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1Select input method

Single conversion

Enter one octal number to convert

Batch conversion

Convert multiple octal numbers at once

File conversion

Upload a text file for batch conversion

2Enter octal number

Octal numbers can only contain digits 0-7. Common examples: 755 (file permissions), 644 (file permissions), 123, 4567

Octal conversion guide

Octal: a base-8 number system using only digits 0-7

Conversion principle: each octal digit has a weight that is a power of 8

Common uses: Unix/Linux file permissions (such as 755, 644), computer systems programming

Conversion examples: Octal 755 = 7×8² + 5×8¹ + 5×8⁰ = 448 + 40 + 5 = 493 (decimal)

Instructions

Software Usage Instructions

Basic Workflow

Select a conversion mode: Choose single conversion, batch conversion, or file conversion mode as needed
Enter octal numbers: Enter the octal numbers to be converted in the corresponding input box
View conversion results: The system will automatically display the decimal result and the detailed conversion process
Export results: Batch conversion supports copying results or downloading a CSV file

Input Requirements

Octal numbers can only contain numeric characters from 0 to 7
Batch conversion supports multiple separators such as line breaks, commas, and spaces
File conversion supports text files in .txt, .csv, and .log formats
Single conversion mode supports real-time conversion, displaying results as you type

FAQ

Octal is a base-8 number system that uses only the digits 0 to 7. In computer science, octal is commonly used to represent file permissions in Unix/Linux systems, such as permission codes like 755 and 644, which are octal numbers.

Octal to decimal conversion uses the positional weight expansion method: from right to left, multiply each digit by the corresponding power of 8, then add the results. For example: octal 755 = 7×8² + 5×8¹ + 5×8⁰ = 448 + 40 + 5 = 493 (decimal).

Batch conversion mode supports multiple separator methods: one number per line, separated by commas, separated by spaces, or a mix of these separators. The system will automatically recognize and extract valid octal numbers for conversion.

The octal number system can only use the digits 0-7. If the input contains the digits 8 or 9, the system will mark it as invalid because these digits are not within the octal range. Please check whether the entered number contains only characters from 0 to 7.

Yes, result export is supported in batch conversion and file conversion modes. You can click the "Copy Results" button to copy the results to the clipboard, or click the "Download Results" button to export the conversion results as a CSV file for later use.

Main use cases include: 1) setting and understanding file permissions in Unix/Linux system administration; 2) base conversion practice in computer science studies; 3) data format conversion in software development; 4) interpreting octal parameters in system configuration files.

Octal to Decimal Converter

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Tool Usage

Octal conversion guide