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# BITLSHIFT function

This article describes the formula syntax and usage of the **BITLSHIFT** function (function: A prewritten formula that takes a value or values, performs an operation, and returns a value or values. Use functions to simplify and shorten formulas on a worksheet, especially those that perform lengthy or complex calculations.) in Microsoft Excel.

## Description

Returns a number shifted left by the specified number of bits.

## Syntax

BITLSHIFT(number, shift_amount)

The BITLSHIFT function syntax has the following arguments.

**Number**Required. Number must be an integer greater than or equal to 0.**Shift_amount**Required. Shift_amount must be an integer.

## Remarks

- Shifting a number left is equivalent to adding zeros (0) to the right of the binary representation of the number. For example, a 2-bit shift to the left on the decimal value 4 converts its binary value (100) to 10000, or 16 in decimal.
- If either argument is outside their constraints, BITLSHIFT returns the #NUM! error value.
- If Number is greater than (2^48)-1, BITLSHIFT returns the #NUM! error value.
- If the absolute value of Shift_amount is greater than 53, BITLSHIFT returns the #NUM! error value.
- If either argument is a non-numeric value, BITLSHIFT returns the #VALUE! error value.
- A negative number used as the Shift_amount argument shifts the number of bits to the right.
- A negative number used as the Shift_amount argument returns the same result as a positive shift_amount argument for the BITRSHIFT function.

## Example

The workbook below shows examples of this function. Inspect them, change existing formulas, or enter your own formulas to learn how the function works.

To work more in-depth with the example data in Excel, download the embedded workbook to your computer, and then open it in Excel.

Applies to:

Excel 2013, Excel Online