Excel - Microsoft Excel Round Function

Description

The Excel Round function rounds a supplied number up or down, to a specified number of decimal places. 

The syntax of the function is: 

ROUND( number, num_digits ) 

Where the arguments are as follows: 

The above arguments can be supplied as either simple numbers, references to cells containing numbers, or as values returned from other functions or formulas. 

Round Function Examples

The following spreadsheet shows the Excel Round function used with different argument values : 

The above examples show how the Round function will round up or down, to the specified number of decimal places. 

Using the Round Function When Comparing Numbers in Excel: 

It is often a good idea to use the Round function when comparing two numbers in Excel, especially if the numbers are the result of multiple mathematical calculations. This is because multiple calculations may result in the introduction of rounding errors, which may cause small inaccuracies in the numbers stored in Excel. 

For example, the decimal 5.1 may, due to rounding errors, be stored in cell A1 of your spreadsheet, as 5.10000000000001. When compared to the exact value 5.1, the value in cell A1 will not be equal to the exact value 5.1. 

However, applying the Round function to the value in cell A1 removes the rounding error. 

ie. the expression 

ROUND( A1, 1 ) = 5.1 

or even 

ROUND( A1, 10 ) = 5.1 

will evaluate to TRUE.