Octal Converter
Convert between octal, decimal, binary, and hexadecimal simultaneously. All four number systems update in real-time. 100% client-side.
31.6Kuses
7.7/10(462)
Octal (Base 8)
0o
Allowed characters: 0-7
Decimal (Base 10)
Allowed characters: 0-9
Binary (Base 2)
0b
Allowed characters: 0-1
Hexadecimal (Base 16)
0x
Allowed characters: 0-9, A-F
Common Values Reference
| Decimal | Octal | Binary | Hex | Note |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | Zero |
| 7 | 7 | 111 | 7 | Max single octal digit |
| 8 | 10 | 1000 | 8 | First two-digit octal |
| 10 | 12 | 1010 | A | Ten |
| 16 | 20 | 10000 | 10 | First two-digit hex |
| 64 | 100 | 1000000 | 40 | First three-digit octal |
| 255 | 377 | 11111111 | FF | Max byte (8 bits) |
| 511 | 777 | 111111111 | 1FF | chmod 777 |
| 4096 | 10000 | 1000000000000 | 1000 | 4 KB |
About Number Base Conversion
Octal (base-8) uses digits 0-7 and is commonly used in Unix file permissions (chmod). This tool converts between all four major number systems simultaneously.
Features
- Real-time simultaneous conversion across all four bases
- Type in any field and all others update instantly
- Support for arbitrarily large numbers via BigInt
- One-click copy for each format
- 100% client-side -- no data sent to any server
Recommended Products
Ad🔢Scientific CalculatorsShop →🔬Lab EquipmentShop →🔬MicroscopesShop →📚Science BooksShop →⚗️Periodic Table PostersShop →💻Laptop StandsShop →🖱️Wireless MouseShop →🔌USB-C HubShop →👓Blue Light GlassesShop →🖥️Desk PadShop →
Affiliate Disclosure: As an Amazon Associate, ToolBird earns from qualifying purchases. Links above are affiliate links — if you buy through them, we may earn a small commission at no extra cost to you.
Disclaimer: This tool is provided as-is for informational and educational purposes only.