Binary to Decimal Converter

Binary to Decimal Converter

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Check Out The Full Number Base Converter Tool
Installable as PWA

Convert binary to decimal (base 2 → base 10)

Use this converter when you have binary integers (base 2) and need the decimal value (base 10).

This page is a focused Binary → Decimal variant built for speed:

  • Batch mode is enabled by default (one value per line)
  • Controls are intentionally hidden to keep this variant fast and distraction-free

Need other bases (octal/hex), swapping, or formatting options? Open the full Number Base Converter.

How to use it

  1. Paste your binary values into the input (left).
  2. Use one number per line.
  3. Copy the decimal results from the output (right).

Signed values are supported:

  • -1001 → -9
  • +1010 → 10

Input rules (binary)

Allowed characters

Binary input may contain only:

  • 0 and 1
  • an optional leading + or -

Examples:

  • 0
  • 1
  • 101010
  • -101010

Optional 0b prefix

You may paste values like:

  • 0b11110000
  • -0b1011

Separators are ignored

Spaces and underscores are ignored, so these are valid:

  • 1111_0000
  • 0b1111 0000

Output format (decimal)

  • Output is a base-10 integer
  • Negative values keep a leading -

Examples:

  • 1010 → 10
  • 11111111 → 255
  • 10000000000 → 1024
  • -1001 → -9

Batch example (one per line)

Input (binary):

1010
11111111
-1001
0b1111 0000
2

Output (decimal):

10
255
-9
240
!ERROR: Binary input may contain only 0 and 1

One invalid line won’t break the rest.

Common use cases

Bitmasks and flags

Binary is ideal for understanding which bits are set. Converting to decimal helps match what a UI, API, or database stores.

Debugging and logs

Some tools print binary strings, while others print decimal numbers. This converter helps you move between them quickly.

Learning fundamentals

Binary → decimal conversion is a core skill in computer science, embedded systems, and digital electronics.

Troubleshooting

“Binary input may contain only 0 and 1”

A line includes an invalid character (like 2, 8, A, or .).

Fix it by removing invalid characters or switching to the full tool if your input is actually hex/octal/decimal.

Notes

  • This is number base conversion for integers, not text/byte encoding.
  • Everything runs locally in your browser — nothing is uploaded.

Frequently Asked Questions

Yes. Use a leading minus sign (−) or plus sign (+). The sign is preserved in the decimal output.

Yes. This variant runs in batch mode by default: paste one binary integer per line and get one decimal result per line.

Yes. Inputs like 0b101010 are accepted in this variant.

Yes. Spaces and underscores are ignored, so values like 1010_1100 or 0b1111 0000 work.

No. All conversions run locally in your browser.

Try one of our format-specific converters below

Check Out The Full Number Base Converter Tool - Installable as PWA

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