About the Number Base Converter
Convert numbers between decimal, binary, octal and hexadecimal. This tool is free, works in your browser and needs no sign-up.
How to use the Number Base Converter
Type the number, then choose the base it is written in.
Formula used
Each digit is multiplied by the base raised to its position. Example: binary 101 = 1×4 + 0×2 + 1×1 = 5.
Example
With Number 255, Written in Decimal (base 10), the calculator shows: Decimal = 255; Binary = 11111111; Octal = 377.
Frequently asked questions
Is the Number Base Converter free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Number Base Converter?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.