This article describes the formula syntax and usage of the BIN2DEC function in Microsoft Excel.

## Description

Converts a binary number to decimal.

## Syntax

BIN2DEC(number)

The BIN2DEC function syntax has the following arguments:

• Number     Required. The binary number you want to convert. Number cannot contain more than 10 characters (10 bits). The most significant bit of number is the sign bit. The remaining 9 bits are magnitude bits. Negative numbers are represented using two's-complement notation.

## Remark

If number is not a valid binary number, or if number contains more than 10 characters (10 bits), BIN2DEC returns the #NUM! error value.

## Example

Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.

 Formula Description Result =BIN2DEC(1100100) Converts binary 1100100 to decimal 100 =BIN2DEC(1111111111) Converts binary 1111111111 to decimal -1

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