Binary to Decimal Converter Online Free

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Binary to Decimal — convert binary to decimal

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⌃⏎ run · ⎋ clear · / focus input

Binary

Decimal · base 10

send result to

no matches

Hexadecimal · base 16

Binary · base 2

Octal · base 8

Enter a binary value above to convert it

Binary to Decimal Online

Updated 2026-07-09

Convert binary to decimal online for free. Paste a binary value — spaces between groups are fine — and SnapTools shows its base-10 value instantly, in your browser. Nothing you enter is uploaded.

Binary is how computers store numbers, but to reason about sizes and ranges you need the everyday decimal value. This converter sums the place values for you — 1111 is 8+4+2+1 = 15, and a full byte of ones is 255 — so you can read raw bits as ordinary numbers. For every base at once, use the Number Base Converter.

// how to use

1 Paste or type a binary value into the input (spaces between groups are fine).
2 SnapTools converts it to a decimal (base-10) number as you type.
3 Copy the decimal result, or open the Number Base Converter for all bases at once.

// examples

Four bits

Input

Output

Full byte

Input

11111111

Output

// common uses

Reading a binary value as an ordinary number Understanding byte ranges and place values Learning positional notation in base 2 Checking a manual binary-to-decimal conversion

// faq

No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.

Add up the place values where a bit is 1 — from the right they are 1, 2, 4, 8, 16, and so on. So 1111 is 8+4+2+1 = 15. This tool sums them for you.

N bits hold values from 0 to 2^N − 1. Eight bits (one byte) reach 255; sixteen bits reach 65535. That is why a full byte of ones is 255.

Yes. Spaces separating your binary groups are ignored, so byte-spaced binary pastes cleanly.

Binary only uses 0 and 1. Any other character is flagged so you can fix it rather than getting a wrong number.

// related

Decimal to Binary Binary to Hex Hex to Decimal Number Base Converter Binary to Text

Use this via API

Get a free API key →

curl -X POST https://snaptools.dev/api/v1/tools/binary-to-decimal \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"number":"1111"}'