# Excel BITLSHIFT Function

Summary

The Excel BITLSHIFT function shifts a number by the specified number of bits, effectively doubling or halving the number a specified number of times.

Purpose

Returns a number shifted left by some number of bits

Return value

Decimal Number

Syntax

=BITLSHIFT (number, shift_amount)

Arguments

**number**- The number to be bit shifted.**shift_amount**- The amount of bits to shift, if negative shifts bits to the right instead.

Usage notes

For any bit shift that results in integer overflow, where the result is larger than 2^48 -1, the function returns the #NUM! error.

### How It Works

The shift_amount can either be positive or negative. If a negative number is provided, the bits are shifted to the right instead.

Good links

## Excel Formula Training

Formulas are the key to getting things done in Excel. In this accelerated training, you'll learn how to use formulas to manipulate text, work with dates and times, lookup values with VLOOKUP and INDEX & MATCH, count and sum with criteria, dynamically rank values, and create dynamic ranges. You'll also learn how to troubleshoot, trace errors, and fix problems. Instant access. See details here.