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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal bases.

Introduction

Number Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal bases. Enter Value, From Base, To Base to get an instant, accurate result.

Formula

The input is parsed as a number in the "from" base, converted to a decimal (base 10) integer, then re-expressed in the "to" base (supports any base from 2 to 36).

Step-by-step

  1. Enter the Value.
  2. Enter the From Base.
  3. Enter the To Base.
  4. Click Calculate to see your result instantly.

Real-world example

Example: With Value = FF, From Base = 16, To Base = 10, the Number Base Converter gives Result: 255.

Frequently Asked Questions

Which bases are supported?
Any base from 2 (binary) to 36, including the common cases of binary (2), octal (8), decimal (10), and hexadecimal (16).
What digits are used for bases above 10?
Letters A–Z represent digit values 10–35, e.g. in hexadecimal A=10 and F=15.
What inputs does the Number Base Converter need?
You'll need to provide: Value, From Base, To Base. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Number Base Converter?
The Number Base Converter applies the formula exactly as calculated — The input is parsed as a number in the "from" base, converted to a decimal (base 10) integer, then re-expressed in the "to" base (supports any base from 2 to 36). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Number Base Converter free to use?
Yes, the Number Base Converter is completely free, requires no signup, and runs instantly in your browser.

About the Number Base Converter

The Number Base Converter uses a real, verifiable formula — The input is parsed as a number in the "from" base, converted to a decimal (base 10) integer, then re-expressed in the "to" base (supports any base from 2 to 36). — so results are accurate every time, not an approximation.