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Octal ↔ Decimal Converter

Convert between octal (base 8), decimal, binary and hexadecimal.

OctalBase 8 — digits 0–7

DecimalBase 10 — digits 0–9

BinaryBase 2 — bits 0 and 1

HexadecimalBase 16 — 0–9, A–F

Octal and Unix File Permissions

Octal notation is commonly used for Unix/Linux file permissions (chmod):

Chmod	Symbolic	Meaning
755	rwxr-xr-x	Owner: full, Others: read+execute
644	rw-r--r--	Owner: read+write, Others: read
777	rwxrwxrwx	Full access for everyone

About Octal ↔ Decimal Converter

Converting between different units and formats shouldn't require googling formulas or downloading apps. Octal ↔ Decimal Converter handles it instantly in your browser, letting you convert between octal (base 8), decimal, binary and hexadecimal with precision. Results update in real time as you type, and all processing happens locally on your device.

How to Use

Enter a value Type the number you want to convert into the input field.

Select units Choose the source and target units from the dropdown menus.

Get instant results The converted value appears immediately as you type — no button press needed.

Copy the result Click the Copy button or select the output value to copy it for use elsewhere.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use Octal ↔ Decimal Converter?

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Real-Time Conversion Results update instantly as you type — no need to press a button. Quickly compare multiple values or find the exact conversion you need.

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High Precision Octal ↔ Decimal Converter uses accurate conversion factors from international standards. Results are precise enough for engineering, scientific, and professional use.

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Mobile Ready Fully responsive design works perfectly on phones and tablets. Great for quick conversions when you're shopping, cooking, or traveling.

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All Common Units Covers the most commonly needed unit conversions, including both metric (SI) and imperial systems, so you always find what you're looking for.

Frequently Asked Questions

Multiply each octal digit by 8 raised to its position (right to left, starting at 0). Example: 755 = 7×64 + 5×8 + 5×1 = 448+40+5 = 493.

Each permission group (owner/group/others) has 3 bits (read/write/execute), which maps perfectly to a single octal digit (0–7). This makes chmod values compact and memorable.