Hex to Octal Converter
Enter a hexadecimal value to instantly convert it to octal, along with decimal and binary outputs.
Last updated: May 30, 2026
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Buy me a coffeeWhat is Hex to Octal Converter?
Hexadecimal (base 16) uses digits 0–9 and A–F. Octal (base 8) uses digits 0–7. Both are common in computing: hex is used in memory addresses, color codes, and packet data; octal appears in Unix file permissions and legacy systems.
Converting between them requires going through a common base. The simplest approach is to convert hex to the intermediate binary representation (since each hex digit maps to 4 bits) and then group those bits into threes (since 2³ = 8) to obtain octal digits.
For example, hex 1F: - 1 → 0001, F → 1111 → binary 00011111 - Group into threes from right: 000 111 11 → pad left: 0011111 - Octal: 37
How to Use Hex to Octal Converter
Type or paste a hexadecimal number in the input field (with or without 0x prefix).
The octal, decimal, and binary outputs update in real time.
Click any copy button to copy the result to your clipboard.
Click "Load Sample" to see an example.
Common Use Cases
- Converting hex memory addresses to octal for legacy system interfaces.
- Cross-checking number base conversions in computer science coursework.
- Networking and permission calculations involving both hex and octal formats.
Example Input and Output
The hex value FF converts to octal 377, which is the common Unix all-permissions mask.
FF377Data Privacy
All conversions run entirely in your browser. No data is sent to any server.
Frequently Asked Questions
Why go through binary when converting hex to octal?
Hex digits represent 4 bits each and octal digits represent 3 bits each. Binary is the natural common ground — converting hex to binary then regrouping into 3-bit chunks gives octal.
Can I enter lowercase hex digits?
Yes. Both uppercase (A–F) and lowercase (a–f) are accepted.
Does this handle very large hex values?
Yes. BigInt is used internally, supporting arbitrarily large integers.
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