﻿ DEC2BIN function

# 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 10-character (10-bit) 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's-complement 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?

Important   Do not select the row or column headers.

Selecting an example from Help

2. Press CTRL+C.

3. In Excel, create a blank workbook or worksheet.

4. 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.

5. 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.

 1 2 3
 A B Formula Description (Result) =DEC2BIN(9, 4) Converts decimal 9 to binary with 4 characters (1001) =DEC2BIN(-100) Converts decimal -100 to binary (1110011100)

Applies To: Excel 2010, Excel Starter, Excel Online, SharePoint Online

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