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Conversion

Base Converter

Convert numbers between any bases.

Enter your values

Enter the number you are working with.

Choose one of: Binary (2), Octal (8), Decimal (10), Hex (16).

Enter the to base you are working with.

Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.

Results
Base 16
FF
Decimal
255
Binary
11111111
Octal
377
Hexadecimal
FF

Quick answer

Changing base rewrites the same quantity using a different set of digits; the value is unchanged.

At a glance

What it doesConvert numbers between any bases.
CategoryConversion
Inputs neededNumber, From base, To base
Main outputBase 16
CostFree — no sign-up, no download

How to use the Base Converter

  1. 1Type the number using digits valid for its base.
  2. 2Select the base it is currently written in.
  3. 3Enter the target base (2–36).

Inputs explained

Number
Enter the number you are working with.
From base
Choose one of: Binary (2), Octal (8), Decimal (10), Hex (16).
To base
Enter the to base you are working with.

Worked example

Using the values the calculator loads with:

Inputs

  • Number255
  • From baseDecimal (10)
  • To base16

Results

  • Base 16FF
  • Decimal255
  • Binary11111111
  • Octal377
  • HexadecimalFF

Frequently asked questions

Why is hex used in computing?

One hex digit maps exactly to four bits, making binary compact and readable.

Can it handle decimals?

This tool converts whole numbers only.

What do I need to enter into the Base Converter?

Just 3 values: number, from base, to base. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.

How does the Base Converter work out the answer?

Changing base rewrites the same quantity using a different set of digits; the value is unchanged. The working is shown step by step so you can verify the result by hand.

Is the Base Converter free, and do I need an account?

It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.