Programmer's Calculator
Convert between decimal, hexadecimal, binary, and octal number systems. See all base representations simultaneously. Free, no sign-up.
How to Use
1
Enter a number
Type a number in the input field.
2
Select input base
Choose whether your input is decimal, hex, binary, or octal.
3
View conversions
See the number represented in all four bases simultaneously.
Features
4 Number Bases
Convert between decimal, hexadecimal, binary, and octal.
Instant Conversion
All representations update in real-time as you type.
Developer Friendly
Hex output in uppercase for easy reading.
Copy Results
Copy any base representation to your clipboard.
Frequently Asked Questions
Calculator guides
Recommended Reading
Practical guides matched to this calculator, its inputs, and the result users need to trust.
4 guides