Free online Number Converter: Decimal, Binary, Hex
Our Number Converter: Decimal, Binary, Hex tool is completely free and works directly in your browser. Convert a number to decimal, binary, octal, hexadecimal and Roman numerals in real time. No signup required, no data sent to any server.
How to use this tool?
Simply fill in the fields above and the result appears instantly. Our number converter: decimal, binary, hex supports decimal, binary, hexadecimal, Roman. The tool is optimized for both mobile and desktop.
Why use SmartGap Tools?
SmartGap Tools offers over 30 free online tools. Also check out: Unit Converter, Percentage Calculator. All our tools are fast, free and privacy-friendly.
What is a number converter?
A number converter translates values between different numeral systems. Enter a decimal number and instantly see it in binary, octal, hexadecimal and Roman numerals. This is essential for programming, networking and digital electronics.
Common numeral systems
- Decimal (base 10): the everyday number system using digits 0-9.
- Binary (base 2): used by computers, only 0 and 1. Example: 42 = 101010.
- Hexadecimal (base 16): compact representation using 0-9 and A-F. Example: 255 = FF.
- Octal (base 8): used in Unix file permissions. Example: 255 = 377.
Frequently Asked Questions
How does this number converter work?
Enter a number in any base (decimal, binary, hex or octal) and the tool instantly converts it to all other formats, including Roman numerals.
Can I convert binary to decimal?
Yes, enter a binary number (e.g., 101010) and the converter shows the decimal equivalent (42) along with hex, octal and Roman numeral forms.
What number formats does this calculator support?
Decimal (base 10), binary (base 2), octal (base 8), hexadecimal (base 16) and Roman numerals. Conversions happen in real time as you type.
Is this number conversion calculator free?
Yes, completely free with no registration. Everything runs locally in your browser.
How do I convert hex to decimal?
Enter the hexadecimal value (e.g., FF) and read the decimal result (255). The tool also shows the binary and octal equivalents.