Binary to Decimal
Convert binary numbers to decimal instantly. For example, 1011010 in binary is 90 in decimal.
Binary to Decimal — quick reference
| Binary | Decimal |
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How to use the Binary to Decimal
- Type or paste your binary value on the left.
- Read the decimal result on the right — separate multiple values with spaces.
- Copy the result, or check the reference table below.
About the Binary to Decimal
This tool converts binary numbers to decimal. Binary is base 2, written with the digits 0 and 1; decimal is base 10, written with 0 through 9. Type a value on the left and the decimal result appears instantly, and you can convert several values at once by separating them with spaces.
Worked example. Take 1011010 in binary. Expand each digit by its place value: 1×2^6 + 0×2^5 + 1×2^4 + 1×2^3 + 0×2^2 + 1×2^1 + 0×2^0 = 90 in decimal.
Binary is the form your hardware actually holds — every byte in memory, every character in an ASCII string, every pixel flag is ultimately ones and zeros — whereas decimal is the shape those quantities take once a person needs to read them. Turning one into the other changes the notation alone; the number keeps its exact value, since whole-integer conversion never rounds or approximates. The table lower down gives further binary-to-decimal pairs to spot-check against, and because the arithmetic is done entirely in your browser, none of the values you paste are sent anywhere. For the reverse direction use the decimal to Binary converter, or the all-in-one number base converter for arbitrary bases.
Frequently asked questions
What is 1011010 in binary converted to decimal?
1011010 in binary equals 90 in decimal. You can confirm it with the worked example above, or by typing 1011010 into the converter.
Is this binary to decimal conversion exact?
Yes. Converting a whole number between bases changes only how it is written, not its value, so there is no rounding. 1011010 and 90 are the same quantity expressed in base 2 and base 10.
Can I convert more than one binary value at once?
Yes. Separate each binary value with a space and every one is converted to decimal on its own, in order.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser with JavaScript; nothing you type is sent to a server.