What is a number base?

A number base (or radix) defines how many unique digits are used to represent numbers. Decimal uses 10 digits (0-9), binary uses 2 (0-1), hexadecimal uses 16 (0-9, A-F).

Why do programmers use hexadecimal?

Hexadecimal is compact (one hex digit = 4 binary digits), making it ideal for representing memory addresses, color codes (#FF5733), and binary data in a human-readable format.

How do I convert binary to decimal?

Each binary digit represents a power of 2. For example, binary 1010 = 1×8 + 0×4 + 1×2 + 0×1 = 10 in decimal. Our tool handles this conversion instantly.

What bases are supported?

Our converter supports all bases from 2 to 36. Common bases include binary (2), octal (8), decimal (10), and hexadecimal (16). You can also use any custom base.

Can I convert negative numbers?

This tool works with positive integers. For negative numbers, enter the absolute value and add the sign manually to the result.

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Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal, and any base (2-36)

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Input Number

From Base

Custom Base (2-36)

How It Works

Enter Number

Type a number in the input field

Select Base

Choose the base of your input number

See Results

All conversions are displayed instantly

Frequently Asked Questions

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Last updated: Feb 27, 2026