What is an octal number?

An octal number is a number expressed in the base-8 numeral system, which uses eight digits: 0, 1, 2, 3, 4, 5, 6, and 7.

What is a decimal number?

A decimal number is a number expressed in the base-10 numeral system, which uses ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

Is there a limit to the length of the octal number I can convert?

While there might be practical limits based on processing power, the tool can handle reasonably long octal strings.

Octal to Decimal Converter

Convert octal numbers (base-8) to decimal numbers (base-10) with this simple online tool.

Octal number

How to Use This Tool

Enter the octal number you want to convert into the input field.
The decimal equivalent will be displayed automatically.
You can copy the result to your clipboard for use elsewhere.

Learn More About Octal to Decimal Converter

Octal and Decimal Number Systems

The octal number system is a base-8 system, using digits from 0 to 7. Each position in an octal number represents a power of 8. The decimal number system is a base-10 system, using digits from 0 to 9.

Example

Octal: 23

Decimal: (2 8^1) + (3 8^0) = 16 + 3 = 19

About

Convert octal numbers (base-8) to decimal numbers (base-10) with this simple online tool. Just enter an octal string, and the converter will instantly display its decimal equivalent.

Use Cases

Computer science education and learning number systems
Software development for handling file permissions
Digital electronics and embedded systems programming
Understanding different data representations

Frequently Asked Questions