What is this calculator for?

It does arithmetic (add, subtract, multiply, divide) in a chosen number base: binary, octal, decimal, or hex. It does not convert text to binary/hex; use the Text ⇄ Binary ⇄ Hex converter for that.

Can I use negative numbers?

In decimal base you can enter negative numbers. In binary, octal, and hex, inputs are non-negative; the result can still be negative (e.g. 1 − 2).

Where do I convert text to hex or binary?

Use the Text ⇄ Binary ⇄ Hex ⇄ Octal converter for encoding conversion. This tool is for numeric arithmetic in a given base.

Number Base Calculator

Free binary, hex, octal, and decimal calculator. Instant arithmetic, no sign-up.

Add, subtract, multiply, and divide in binary, octal, decimal, or hexadecimal.

Number base

First number

Second number

Operation

Result (decimal)

0 + 0

To convert text to binary, hex, or octal (encoding), use the Text ⇄ Binary ⇄ Hex ⇄ Octal converter.

About the number base calculator

Free calculator for arithmetic in binary, octal, decimal, and hexadecimal. Choose a base, enter two numbers, and add, subtract, multiply, or divide. Results and remainder are shown in the same base. No sign-up required.

Binary (base 2), octal (8), decimal (10), hex (16)
Add, subtract, multiply, divide with remainder for division
Copy result and reset

Use cases

Programming and digital logic
Computer science and math
Quick base-N arithmetic

For converting text to binary, hex, or octal (encoding), use the Text ⇄ Binary ⇄ Hex ⇄ Octal converter.

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Added Apr 22, 2026

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