Octal to Hexadecimal Converter
Convert octal numbers to hexadecimal representation online. Free, fast, and runs entirely in your browser.
Input
Output
What Is Octal to Hexadecimal Conversion?
Octal to hexadecimal conversion transforms numbers from the base-8 (octal) numeral system into the base-16 (hexadecimal) numeral system. Both are positional numeral systems defined by their <a href="https://en.wikipedia.org/wiki/Radix" target="_blank" rel="noopener">radix (number base)</a>. Octal uses digits 0-7, while hexadecimal uses digits 0-9 and letters A-F to represent values.
Both octal and hexadecimal are commonly used in computing. Hexadecimal is widely used for memory addresses, color codes, and low-level programming, while octal is used in Unix file permissions and some legacy systems. For a detailed mathematical treatment of hexadecimal, see <a href="https://mathworld.wolfram.com/Hexadecimal.html" target="_blank" rel="noopener">Wolfram MathWorld</a>. This tool converts octal integers to their hexadecimal equivalents instantly.
How to Use This Tool
Enter Octal Numbers
Type or paste one octal number per line in the left editor. You can also click Sample to load example values, or Upload a text file.
View Hexadecimal Output
The right panel updates automatically with the hexadecimal representation of each octal number. The output uses uppercase letters (A-F).
Copy or Download
Click Copy to copy the hexadecimal output to your clipboard, or Download to save it as a text file.
Conversion Examples
Here are some common octal to hexadecimal conversions:
Octal Input
Hexadecimal Output
Frequently Asked Questions
How does octal to hexadecimal conversion work?
The conversion works by first converting the octal number to its decimal (base-10) equivalent, and then converting that decimal value to hexadecimal. For example, octal 377 equals decimal 255, which equals hexadecimal FF. You can practice this at Math is Fun.
Does this tool support the 0o prefix?
Yes. The tool automatically strips the 0o prefix before converting. You can enter values like 0o377 or just 377.
Is my data sent to a server?
No. All processing happens locally in your browser. No data leaves your machine.
Does it support negative numbers?
Yes. Negative octal numbers produce a hexadecimal result prefixed with a minus sign (e.g., -377 becomes -FF). You can also try CalculatorSoup's octal-to-hex converter to cross-check results.
Related Tools
Learn more: Khan Academy digital information course, Cisco hex guide for networking, and the Wikipedia article on octal.