DEC2BIN function
This article describes the formula syntax and usage of the DEC2BINfunction in Microsoft Excel.
Description
Converts a decimal number to binary.
Syntax
DEC2BIN(number, [places])
The DEC2BIN function syntax has the following arguments:

Number Required. The decimal integer you want to convert. If number is negative, valid place values are ignored and DEC2BIN returns a 10character (10bit) binary number in which the most significant bit is the sign bit. The remaining 9 bits are magnitude bits. Negative numbers are represented using two'scomplement notation.

Places Optional. The number of characters to use. If places is omitted, DEC2BIN uses the minimum number of characters necessary. Places is useful for padding the return value with leading 0s (zeros).
Remarks

If number < 512 or if number > 511, DEC2BIN returns the #NUM! error value.

If number is nonnumeric, DEC2BIN returns the #VALUE! error value.

If DEC2BIN requires more than places characters, it returns the #NUM! error value.

If places is not an integer, it is truncated.

If places is nonnumeric, DEC2BIN returns the #VALUE! error value.

If places is zero or negative, DEC2BIN returns the #NUM! error value.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?

Select the example in this article.
Important Do not select the row or column headers.
Selecting an example from Help

Press CTRL+C.

In Excel, create a blank workbook or worksheet.

In the worksheet, select cell A1, and press CTRL+V.
Important For the example to work properly, you must paste it into cell A1 of the worksheet.

To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

