➗ Math
Number Base Converter
A number written in any base is just a sum of digits times powers of that base — 1F in hexadecimal is 1×16 + 15, which is 31. This converter parses your input into exact integer arithmetic rather than floating point, so long binary strings stay accurate all the way through the conversion.
How it works
Value to convert
Input base
Decimal (base 10)
Binary (base 2)
Octal (base 8)
Hexadecimal (base 16)
Base 36
Frequently asked questions
How do I use the Number Base Converter?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.