Binary Decimal Convert Calculator

Convert any 8‑bit binary string to decimal (and back) instantly, free.

  • Free
  • No sign-up
  • Instant results

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How to use it

  1. Enter a binary number (up to 8 bits) or a decimal value in the appropriate field.
  2. Click the Convert button.
  3. Read the opposite format displayed below.

What it does The tool reads a binary string of up to 8 bits (e.g., 1011) and instantly shows its decimal equivalent, and vice‑versa.

Why it matters Understanding the numeric relationship helps when debugging low‑level code, configuring hardware registers, or learning number systems.

How to read the output

  • The Decimal field displays the base‑10 value of the entered bits.
  • The Binary field shows the 0‑1 representation of the entered decimal, padded to the length you entered (up to 8 bits).

No ads, no accounts—just a quick conversion you can trust.

Pro tips

  • Only 0s and 1s are valid for binary input; extra characters are ignored.
  • If you need more than 8 bits, split the number into separate 8‑bit groups.
  • Leading zeros in decimal input have no effect on the result.
  • Copy the result before changing the other field to avoid overwriting it.

Real-life examples

  • A student checks homework conversions before submitting a math assignment.
  • An embedded engineer sets an 8‑bit register value while programming a microcontroller.
  • A data analyst verifies binary IDs against their decimal equivalents in a spreadsheet.

Case study

Maria, a junior developer, spent minutes manually converting 8‑bit flags. After using the calculator, she got instant results and fixed a bug in seconds.

Frequently asked questions

How many bits can I convert?
The calculator accepts binary strings up to 8 bits long.
Can I convert negative numbers?
It only handles non‑negative integers represented in standard binary.
What if I type letters in the binary field?
Only digits 0 and 1 are accepted; other characters are ignored.
Is the conversion reversible?
Yes—entering the result in the opposite field returns the original value.
Do I need an internet connection?
The tool runs in your browser, so no connection is required after the page loads.