How do I convert binary to decimal?

Paste your binary number, select base 2 as input and base 10 as output. The decimal result appears instantly.

Does it support hex prefixes like 0x?

Yes — optional 0x, 0b and 0o prefixes are stripped automatically before conversion.

Can I convert large numbers?

Integers within JavaScript safe integer range convert accurately. Very large values may lose precision.

Is negative binary supported?

Decimal negatives are supported. Binary and hex inputs expect unsigned digit strings.

Are letters case-sensitive in hex?

No — A-F and a-f are treated the same.

Is my input uploaded?

No. Conversion runs entirely in your browser.

What bases are supported?

Binary (2), octal (8), decimal (10) and hexadecimal (16).

Can I copy the result?

Yes — use the copy button on the output panel.

Number Base Converter

Convert Live

Convert numbers between binary, decimal, hex and octal.

About this tool

Number Base Converter — Convert numbers between binary, decimal, hex and octal. Free, fast and private. Runs entirely in your browser at Quick Calci Tools.

Who uses the Number Base Converter?

Common scenarios and audiences for this tool.

CS students

Convert homework answers between binary and decimal.

Embedded devs

Translate register masks from hex to binary.

Network engineers

Quickly decode bit patterns in subnet math.

CTF players

Switch bases while solving encoding puzzles.

Teachers

Demonstrate positional numeral systems live in class.

Frequently asked questions

Everything you need to know about the Number Base Converter.